Marine Benthic Algae of the Houtman Abrolhos Islands, Western Australia.

John M. Huisman School of Biological and Environmental Sciences, Murdoch University Murdoch, Western Australia 6150, Australia

Abstract Recent collections and published records of marine benthic algae from the Houtman Abrolhos are catalogued. Two hundred and sixty species are included, comprising 32 species of green algae (Chlorophyta), 50 species of brown algae (Phaeophyta), and 178 species of red algae (Rhodophyta). Fifty-three species and four varieties are newly recorded for the Indian Ocean coast of Western Australia. The algal flora of the islands includes a mixture of typically temperate species (e.g. the kelp Ecklonia radiata (C. Agardh) J. Agardh) along with many species usually found at more northern latitudes in tropical waters (e.g. the red alga Trichogloea requienii (Montagne) Kiitzing).

Introduction The Houtman Abrolhos is a group of mainly coral islands lying some 50-70 km offshore from Geraldton, Western Australia. They include the most southerly coral reefs in the Indian Ocean, and no doubt owe their presence to the influence of the Leeuwin Current, which brings warm waters from the tropics along the coast of Western Australia. The influence of the Leeuwin Current can be sporadic, and this juxtaposition of warm tropical water with the colder water more typical of these latitudes encourages unusual associations and contributes to a wide diversity of organisms (Hatcher 1991). The marine algae of the islands are poorly known, with only sporadic records appearing in the literature (e.g. Levring 1953; May 1946, 1951; Lucas 1926), mostly derived from collections made by the 'Percy Sladen Trust' expeditions of 1913 and 1915 (see Dakin 1918-1922) or collections made by school groups and presently lodged in the Adelaide herbarium. These publications include, at most, only a few species. During the past ten years the author has made regular trips to the islands to collect marine algae, resulting in the descriptions of several new taxa (e.g. Kraft & Wynne 1992; Huisman & Kraft 1992, 1994; Huisman 1994; Huisman & Gordon-Mills 1994; Huisman & Millar 1996) and a collection of well over a thousand specimens. The present account includes all of the species recognised in those collections as well as all known published records. The account of the genus Sargassum was contributed by Gary Kendrick (CSIRO Marine Laboratories, Marmion, Western Australia). 178 J.M. HUISMAN

Materials and methods All recent collections were preserved in 5% formaldehyde before being dried and mounted. Most specimens are housed in the herbarium of the School of Biological and Environmental Sciences, Murdoch University (MURU), except where otherwise indicated. Herbarium abbreviations follow Holmgren et al. (1990).

Arrangement of the Cat\].logue All known species of marine benthic algae recorded from the Houtman Abrolhos are included. The majority are derived from recent collections made by the author and his associates, while a few taxa are known only through previously published accounts. The sequence of presentation is: Division Chlorophyta, Division Phaeophyta, Division Rhodophyta, with the lower level taxa (Order, Family, Genus, Species) within each division arranged in alphabetical order. The presently accepted binomial is given for each species, followed by the basionym, a recent reference, the type locality, distribution data, and selected specimens.

Discussion The present account records some 260 species of marine benthic algae for the Houtman Abrolhos, comprising 32 species of green algae (Chlorophyta), 50 species of brown algae (Phaeophyta) and 178 species of red algae (Rhodophyta). Included are 53 species and four varieties newly recorded for the Indian Ocean coast of Western Australia (Table 1). This listing should not be regarded as comprehensive for the region, however, as there remain many specimens in the author's collection that could not be identified with any confidence due to inadequate material. The actual total number of species is likely to be well over 300. The marine flora of the islands is a diverse assemblage, and includes a mixture of species from both tropical and temperate origins. The former category includes typically tropical taxa such as Boodlea composita, Caulerpa webbiana, C. cupressoides, C. lentillifera, Trichogloea requienii, Acanthophora spicifera, Spirocladia barodensis, Predaea weldii, Titanophora weberae, and Ceratodictyon spongiosum. Examples of taxa with more temperate affinities are Caulerpa obscura, C. simpliciuscula, Codium laminarioides, Myriodesma quercifolium, Ecklonia radiata, Carpothamnion gunnianum, Hennedya crispa, and Erythroclonium sonderi. Many of these species are at the southernmost limit (in the case of tropical species) or northernmost limit (in the case of temperate species) of their distribution at the Houtman Abrolhos. The affinities of the marine algae of the Houtman Abrolhos are therefore suggestive of a transitional zone between tropical and temperate regions. That this should exist at a more southern latitude than would normally be expected is, no doubt, due to the influence of the Leeuwin current, which carries warm, tropical waters in a southerly direction along the coast of Western Australia (Cresswell 1991). This influx of warm water is also sporadic, a situation that is likely to further contribute to the diversity of algae found at the Houtman Abrolhos. Hatcher (1991) recognised the influence of the Leeuwin current on the marine algal assemblages on a broad scale - this is now confirmed by the more detailed listing included herein. Further collections and taxonomic studies of the many inadequately represented species are required before our knowledge of the marine algae of the Houtman Abrolhos can be regarded as comprehensive. The present account, however, is a significant addition to the recognition BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 179

of the marine flora of the Houtman Abrolhos (and Western Australia), and is a first step in the description of the marine flora of the poorly known northern regions of Western Australia.

Acknowledgements This study would not have been possible without the contributions of many individuals who have organised or participated in field trips. In particular I would like to thank Ian McKernan (Murdoch University) for his tireless efforts. I would also like to acknowledge the Western Australian Fisheries Department (in particular Randall Owen) for allowing the use of the field station at Beacon Island. Numerous people have acted as diving buddies and they are gratefully acknowledged, in particular Dr Thomas Rose (Murdoch University), Dr Gary Kendrick (CSIRO Marine Laboratories, Marmion), and Tim Carruthers (University of Western Australia). Drs Gerry Kraft (University of Melbourne), Gary Kendrick, Julie Phillips (University of Queensland), Ian Price (James Cook University, Townsville), Alan Millar (National Herbarium of New South Wales), Roberta Townsend (Murdoch University) and Professors Bryan Womersley (State Herbarium of South Australia) and Michael Wynne (University of Michigan) have all contributed to this study by identifying specimens or giving advice. Thanks also to Associate Professor M.A. Borowitzka (Murdoch University) for his support. Financial support was provided by an ARC 'Australian Research Fellowship' and an ARC small grant for the study of the marine flora of the islands.

Table 1. Taxa newly recorded for Western Australia(* =new record for Australia).

Rhodophyta Platysiphonia corymbosa Platysiphonia marginalis Amphiroa foliacea Polysiphonia gracilis Antithamnion antillanum Predaea laciniosa Botryocladia skottsbergii Predaea weldii Callophycus serratus Rhodymenia leptophylla Ceramium mazatlanense Spirocladia barodensis Champia parvula Titanophora weberae Chondria dangeardii Trichogloea requienii Chrysymenia kaernbachii Yamadaella caenomyce Chrysymenia ornata Chlorophyta Coelothrix irregularis Anadyomene brownii Corallophila huysmansii Boodlea composita Dasya iyengarii Dasya pilosa Bryopsis minor Endosiphonia spinuligera Caulerpa fergusoniii Caulerpa mexicana Gelidiella pannosa Caulerpa racemosa var. corynephora Gelidiopsis variabilis Caulerpa racemosa var. lamourouxii Glaphrymenia pustulosa Caulerpa racemosa var. peltata Gloiocladia indica * Caulerpa racemosa var. turbinata Gloiocladia rubrispora Caulerpa serrulata Gracilaria canaliculata Caulerpa webbiana Hypoglossum caloglossoides Codium geppiorum Kallymenia cribrogloea Dictyosphaeria versluysii Liagora setchellii * Trichosolen hainanensis Lomentaria corallicola Lomentaria monochlamydea Phaeophyta Qre Mesophyllum erubescens * Dictyota ceylanica * Jed Mesophyllum junafutiense * Dictyota mertensii * Monosporus indicus Padina boergesenii H on Peyssonnelia inamoena Padina tenuis 180 J.M. HUISMAN

Division Chlorophyta Order Bryopsidales Family Bryopsidaceae

Genus: Bryopsis Lamouroux 1809b: 333. Bryopsis australis Sonder 1845: 49. Reference: Womersley 1984: 284, figs 96D,E, 97B. Type Locality: Western Australia, probably near Fremantle. Distribution: Houtman Abrolhos, Rottnest Island and adjacent mainland coasts, Western Australia, and Kingscote and Ballast Head, Kangaroo Island, South Australia. Specimen: Nth of Beacon 1., Wallabi Gp. From 2-3 m. (J.M. Huisman, 8.vii.1993; MURU, HA 928). Bryopsis minor Womersley 1955: 387, fig. 1. References: Womersley 1955: 387; Womersley 1984: 276, figs 93A,B, 94A,B. Type Locality: On black buoy, American River inlet, Kangaroo Island, South Australia. Distribution: Houtman Abrolhos, Western Australia, and the type locality and Port MacDonnell, South Australia. Specimens: Nth of Beacon 1., Wallabi Gp. From< 5m. (J.M. Huisman, 28.ix.1994; MURU, HA 604, 605); From 2-3 m. (J.M. Huisman, 8.vii.1993; MURU, HA 929). Eastern Passage, Easter Gp. From 10-20 m. (J.M. Huisman & T.H. Rose, 23.x.1988; MURU, HA 293). Jackson 1., Pelsaert Gp. (J.M. Huisman, 30.ix.l991; MURU, HA 282).

Genus: Trichosolen Montagne 1860: 171. Trichosolen hainanensis (Tseng) Taylor 1962: 61. Pseudobryopsis hainanensis Tseng 1936: 171-174. Reference: Norris 1992: 10-11, figs 29-31. Type Locality: Kuan-nen, Wenchang, Hainan Dao, China. Distribution: Houtman Abrolhos, Western Australia; southern Japan; South Africa; China. Specimens: The Nook, Pelsaert Gp. From 15-20 m. (J.M. Huisman & P Dingle, 3.xii.1988; MURU, HA 276).

Family Caulerpaceae

Genus: Caulerpa Lamouroux 1809b: 332. Note: Species of Caulerpa (particularly C. racemosa and C. cupressoides) are notoriously variable in form and there is much debate over the taxonomic rankings that should be applied to the infraspecific variants. Coppejans and Prud'homme van Reine (1992) have suggested the term 'ecad' to indicate a form that is not genetically fixed, although (as argued by Silva, Basson & Moe- Catalogue of the Benthic Marine Algae of the Indian Ocean, in press) there seems little point in using a term not recognised by the 'International Code of Botanical Nomenclature' when 'forma' will suffice. In this account the infraspecific taxa are treated as varieties, more in an effort to be compatible with the 'traditional' classification than as an acceptance of the taxonomic status implied by its use. Caulerpa cactoides (Turner) C. Agardh 1817: xxiii. Fucus cactoides Turner 1811: 89-90, pl 171. Reference: Womersley 1984: 269, figs 91A, 92C. Type Locality: Southern coast of Australia. Distribution: From Dampier, Western Australia, to the Richmond River mouth, New South Wales. Specimens: Near Pigeon Rock, West Wallabi I. In sand at <2m. (J.M. Huisman, 30.ix.1994; MURU, HA 494, 495). 23. BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 181

Caulerpa cliftonii Harvey 1863: lvii. Reference: Womersley 1984: 265, figs 88F, 89E. Type Locality: Western Australia (probably near Fremantle). Distribution: From the Houtman Abrolhos, Western Australia, to Port Phillip Heads, Victoria. Record: Womersley 1984: 265. Caulerpa cupressoides (Vahl) C. Agardh 1817: xxiii var. lycopodium Weber - van Bosse 1898: 335. Reference: Weber-van Bosse 1898: 323, pis XXVII, XXVIII. Type Locality: Brazil; West Indies (syntypes). Distribution: Widely distributed in tropical seas. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. In sand at 2-3m. (J.M. Huisman, 5.vii.1993; MURU, HA 688). Caulerpafergusonii Murray 1891: 212. Reference: Svedelius 1906: 140, fig. 51. Type Locality: Sri Lanka. Distribution: Indian Ocean. Specimen: Fish Point, East Wallabi I., Wallabi Gp. (J.M. Huisman, 26.ix.1994; MURU, HA 649). Remarks: The present specimens are slightly larger than those figured by other authors. As mentioned by Svedelius (1906), this species is doubtfully distinct from C. cactoides, differing only in the lack of annular constrictions at the base of the upright branches. Caulerpa lentillifera J. Agardh 1837: 173. Reference: Jaasund 1976: 25, fig. 49. Type Locality: Coast of Eritrea. Distribution: Warmer waters of the Indo-Pacific. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. (J.M. Huisman, 5.vii.1993; MURU, HA 650). Caulerpa mexicana Sander ex Kiitzing 1849: 496. Reference: Coppejans & Prud'homme van Reine 1992: 706, figs 6A, 22A (as Caulerpa taxifolia (Vahl) C. Agardh ecad mexicana). Type Locality: Mexico. Distribution: Widely distributed in warmer seas. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. (J.M. Huisman, 5.vii.1993; MURU, HA 655). Remarks: Included as Caulerpa taxifolia (Vahl) C. Agardh ecad mexicana by Coppejans & Prud'homme van Reine (1992). Caulerpa obscura Sander 1845: 50. Reference: Womersley 1984: 265, figs 88F, 89F. Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Walkerville, Victoria. Specimen: Small Islet, Wallabi Gp. From 12-15 m. (J.M. Huisman, 27.ix.1994; MURU, HA 781). Caulerpa racemosa (Forsskill) J. Agardh 1873: 35. Fucus racemosus Forsskill 1775: 191. Reference: Coppejans, 1992: 401, figs 4C, D. Type Locality: Suez, Egypt. Distribution: Widely distributed in warmer seas. Specimens: West of Long I., Wallabi Gp. (l.M. Huisman, 4.vii.1993; MURU, HA 672). 'Anemone Lump', Eastern Passage, Easter Gp. (J.M. Huisman, 20.i.1990; MURU, HA 264). Remarks: In addition to the typical variety, five other varieties of C. racemosa have been collected from the Houtman Abrolhos. Caulerpa racemosa var. corynephora (Montagne) Weber-van Bosse 1898: 364, pl. XXXIII: figs 10-13. Caulerpa corynephora Montagne 1842: 14. Reference: Coppejans & Prud'homme van Reine 1992: 693, fig. 15A (as ecad corynephora). Type Locality: Toud I. (Warrier Islet), Torres Strait, Australia. Distribution: Widely distributed in warmer seas. Specimens: West of Long I., Wallabi Gp. (J.M. Huisman, 4.vii.1993; MURU, HA 652, 656). Caulerpa racemosa var. laetevirens (Montagne) Weber-van Bosse 1898: 366. Caulerpa laetevirens Montagne 1842: 13. Reference: Coppejans & Prud'homme van Reine 1992: 693, fig. 16A, B, C (as ecad laetevirens). Type Locality: Toud I. (Warrier Islet), Torres Strait, Australia. Distribution: Tropical Seas. Specimens: Turtle Bay, East Wallabi I.,Wallabi Gp. (J.M. Huisman, 5.vii.1993; MURU, HA 700). Eastern Passage, Easter Gp. (J.M. Huisman, 23.x.1988 MURU, HA 291). 182 J.M. HUISMAN

Caulerpa racemosa var. lamourouxii (Turner) Weber-van Bosse 1898: 369. Fucus lamourouxii Turner 1816[1815-1819]: 79, pl. 229. Reference: Weber-van Bosse 1898: 368 pl. 32, figs 1-7. Coppejans & Prud'homme van Reine 1992: 693, 696, fig. 15B (as ecact lamourouxii). Type Locality: Red Sea. Distribution: Widely distributed in warmer seas. Specimens: West of Long L, Wallabi Gp. (J.M. Huisman, 4.vii.1993; MURU, HA 653). Caulerpa racemosa var. peltata (Lamouroux) Eubank in Stephenson 1944: 349. Caulerpa peltata Lamouroux 1809b: 332. Reference: Coppejans & Prud'homme van Reine 1992: 696, fig. 17B (as ecad peltata). Type Locality: Antilles, West Indies. Distribution: Widely distributed in tropical seas. Specimens: West of Long I., Wallabi Gp. (l.M. Huisman, 4.vii.1993; MURU, HA 664). 'Anemone Lump', Eastern Passage, Easter Gp. (J.M. Huisman, 20.i.1990; MURU, HA 265). Coral Patches, Pelsaert Gp (J.M. Huisman, 14.iv.1991; MURU, HA 287). Caulerpa racemosa var. turbinata (J. Agardh) Eubank 1946: 420. Caulerpa clavifera (Turner) C. Agardh var. turbinata J. Agardh 1837: 173. Reference: Coppejans & Prud'homme van Reine 1992: 698, 701, fig. 19A, B (as ecad turbinata). Type Locality: Near Tor, Sinai Peninsula, Egypt. Distribution: Widely distributed in tropical seas. Specimens: West of Long L, Wallabi Gp. (J.M. Huisman, 4.vii.1993; MURU, HA 680). Caulerpa serrulata (Forsskal) J. Agardh 1837: 174. Fucus serrulatus Forsskal 1775: 189. Reference: Taylor 1960: 145-146, pl. 14, fig. 5. Coppejans & Prud'homme van Reine 1992: 701-704, fig. 20B. Type Locality: Mokha, Yemen. Distribution: Widely distributed in tropical seas. Specimens: Suomi L, Easter Gp. (J.M. Huisman, 28.ix.1991; MURU, HA 290). Caulerpa simpliciuscula (Brown ex Turner) C. Agardh 1823 [1822-1823]: 439. Fucus simpliciuscula Brown ex Turner 1811: 97-98, pl. 175. Reference: Womersley 1984: 272, figs 91E, 92G. Type Locality: Kent Islands, Bass Strait, Tasmania. Distribution: Houtman Abrolhos, Western Australia, to Walkerville, Victoria, and around Tasmania; Indonesia (Timor). Specimens: 'Batavia' wreck site, Wallabi Gp. From 7 m. (J.M. Huisman, 4.vii.1993; MURU, HA 657, 658). Caulerpa webbiana Montagne 1837: 354. Reference: Coppejans 1992: 406-408, fig. 9. Type Locality: Arrecife, Isla Lanzarote, Islas Canarias. Distribution: Widely distributed in warmer seas. Specimens: West of Long L, Wallabi Gp. (J.M. Huisman, 5.vii.1993; MURU, HA 690). The Nook, Pelsaert Gp. (J.M. Huisman, 24.x.1988; MURU, HA 279).

Family Codiaceae

Genus: Codium Stackhouse 1797: xvi, xxiv. Codium duthieae Silva in Silva & Womersley 1956: 275. Reference: Womersley 1984: 235, figs 77F, 78G. Type Locality: Strandfontein, False Bay, Cape Province, South Africa. Distribution: Southern Australia; Kenya, Mozambique, South Africa. Specimens: North of Beacon L, Wallabi Gp. From 2-3m. (J.M. Huisman, 8.vii.1993; MURU, HA 919). Pot Holes, sth of Beacon L, Wallabi Gp. To 12m. (J.M. Huisman, 8.vii.1993; MURU, HA 920). Codium geppiorum 0. Schmidt 1923: 50. Reference: Adams 1994: 46, pl. 12. Type Locality: Kai Islands and Celebes, Indonesia (syntypes ). Distribution: Warmer waters of the Indo-Pacific BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 183 region. Specimens: West side of Long 1., Wallabi Gp. (J.M. Huisman, 5.vii.1993; MURU, HA 1086). Coral Patches, Pelsaert Gp. (J.M. Huisman, 14.iv.1991; MURU, HA 288). Codium laminarioides Harvey 1855b: 565. Reference: Womersley 1984: 232, figs 77C, 78C. Type Locality: Rottnest 1., Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Pearson 1., South Australia. Specimen: Turtle Bay, East Wallabi 1., Wallabi Gp. From 5 m. (J.M. Huisman, 5.vii.1993; MURU, HA 921). Codium lucasii Setchell in Lucas 1935: 200. Reference: Womersley 1984: 227-228, figs 75C, 76C, D. Type Locality: Bondi, New South Wales, Australia. Distribution: Houtman Abrolhos, Western Australia, around southern Australia and the north coast of Tasmania to Redcliffe, Queensland. South Africa. Specimens: Fish Point, East Wallabi 1., Wallabi Gp. From 10- 12 m. (J.M. Huisman, 26.xi.1994; MURU, HA 760). Codium spongiosum Harvey 1855b: 565. Reference: Womersley 1984: 228, figs 75E, 76F. Type Locality: King George's Sound, Western Australia. Distribution: Point Cloates, Western Australia, to Apollo Bay, Victoria; Lord Howe 1., New South Wales; Queensland; Tasmania; South Africa; Mauritius; New Caledonia; Hawaiian Is.; Brazil. Specimens: Nth of Beacon 1., Wallabi Gp. From < Sm. (J.M. Huisman, 28.ix1994; MURU, HA 598, 602). Eastern Passage, Easter Gp. (J.M. Huisman & T.H. Rose, 23.x.1988; MURU, HA 292).

Family Halimedaceae

Genus: Halimeda Lamouroux 1812: 186. Halimeda cuneata Hering in Krauss 1846: 214. References: Womersley 1984: 244, figs 81C, 82E-G. Type Locality: Natal Bay, South Africa. Distribution: Indian Ocean; south-western Pacific Ocean. Specimens: Turtle Bay, East Wallabi 1., Wallabi Gp. From 10 m. (J.M. Huisman, 27.ix.1986; MURU, HA 262).

Family Udoteaceae

Genus: Penicillus Lamarck 1813: 297. Penicillus nodulosus (Lamouroux) Blainville 1830: 516. Nesaea nodulosa Lamouroux in Quoy & Gaimard 1824: 622. Reference: Harvey 1858: pl. XXII (as Penicillus arbuscula). Type Locality: Moluccas, Indonesia. Distribution: Western Australia, Indonesia. Specimens: North-west of West Wallabi I. (Pigeon Rock), Wallabi Gp. In sand at 1-2.m. (J.M. Huisman, 30.ix.1994; MURU, HA 483, 484).

Order Cladophorales Family Anadyomenaceae

Genus: Anadyomene Lamouroux 1812: 187. Anadyomene brownii (J. Gray) J. Agardh 1887: 127. Calomena brownii J. Gray 1866: 46. 184 J.M. HUISMAN

Reference: Sander 1871: 68-69, tab. VI, figs 1-4. (as Anadyomene muelleri Sander). Type Locality: Australia. Distribution: Northern Australia, Indonesia, Solomon Islands, Philippines. Specimens: Suomi 1., Easter Gp. (J.M. Huisman & G. Kendrick, 28.ix.l991; MURU, HA 284).

Genus: Microdictyon Decaisne 1841:115. Microdictyon umbilicatum (Velley) Zanardini 1862: 461. Conferva umbilicata Velley 1800: 169, pl. 7. Reference: Womersley 1984: 217, fig. 72. Type Locality: New South Wales, Australia. Distribution: Southern Australia; New Zealand; Indonesia. Specimens: North of Beacon 1., Wallabi Gp. On rock at 3 m. (J.M. Huisman, 28.ix.l994; MURU, HA 570, 583, 595).

Order Dasycladales Family Polyphysaceae

Genus: Acetabularia Lamouroux 1812: 185. Acetabularia calyculus Lamouroux in Quay & Gaimard 1824: 621, pl. 90, figs 6, 7. Reference: Womersley 1984: 295, figs lOlB, 102B-D. Type Locality: Shark Bay, Western Australia. Distribution: Widely distributed in tropical and subtropical seas and extending into warm temperate regions. Specimens: Turtle Bay, East Wallabi 1., Wallabi Gp. In seagrass beds at 10 m.(J.M. Huisman, 30.ix.l994; MURU, HA 472).

Order Siphonocladales Family Siphonocladaceae

Genus: Boodlea Murray & De Toni 1889: 243. Boodlea composita (Harvey) Brand 1904: 187. Conferva composita Harvey 1834: 157. Reference: Jaasund 1976: 11, fig. 23. Egerod 1952. Type Locality: Mauritius. Distribution: Tropical and subtropical Indo-Pacific. Specimens: Long 1., Wallabi Gp. To 20 m. (l.M. Huisman, 4. vii.l993; MURU, HA 922, 923, 924). Nth of Beacon 1., Wallabi Gp. From < 5 m. (T. Carruthers, 28.ix.l994; MURU, HA 554). Suomi 1., Easter Gp. < 1 m. (J.M. Huisman, 14.iv.l991; MURU, HA 275).

Genus: Cladophoropsis B¢rgesen 1905: 288. Cladophoropsis herpestica (Montagne) Howe 1914: 31. Conferva herpestica Montagne 1842: 15. Reference: Womersley 1984: 184, figs 58B, 59C. Type Locality: Bay of Islands, New Zealand. Distribution: Houtman Abrolhos, Western Australia, to Queensland; Indo-Pacific; Japan; New Zealand. Specimens: North of Beacon 1., Wallabi Gp. On rock at < 5 m. (J.M. Huisman, 28.ix.l994; MURU, HA 582). Long 1., Wallabi Gp. (J.M. Huisman, 4.vii.l993; MURU, HA 927). Suomi 1., Easter Gp., (J.M. Huisman & G. Kendrick, 28.ix.l991; MURU, HA 283). BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 185

Genus: Siphonocladus Schmitz 1879: 18. Siphonocladus tropicus (Crouan frat.) J. Agardh 1887: 105. Apjohnia tropica Crouan frat. in Schramm & Maze 1865: 47. Reference: Egerod 1952: 356-358, pl. 30, fig 1, g; fig 2, 2-9. Type Locality: Guadeloupe, West Indies. Distribution: Western Australia; Tropical Americas; Hawaiian Isles. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. On rock in Amphibolis antarctica bed at Sm. (J.M. Huisman, 30.x.1994 MURU, HA 449).

Genus: Struvea Sonder 1845: 49. Struvea plumosa Sonder 1845: 50. Reference: Womersley: 1984: 218, fig. 73B,C. Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia, around southern Australia to Encounter Bay, South Australia. Specimens: (Basal portion only) North of Beacon I., Wallabi Gp. On rock at 5 m. (J.M. Huisman, 28.ix.1994: MURU, HA 576, 577).

Family Valoniaceae

Genus: Dictyosphaeria Decaisne ex Endlicher 1843: 18. Dictyosphaeria cavernosa (Forsskal) Bprgesen 1932: 2. Ulva cavemosa Forsskal 1775: 187. Reference: Taylor 1960: 116, pl. 7, fig. 5. Syntype Localities: "Gomfodae" (Al-Qunfidha), Saudi Arabia; Mokha, Yemen. Distribution: Widely distributed in tropical and subtropical seas. Specimens: Nth of Beacon I., Wallabi Gp. From 2-3 m. (J.M. Huisman, 8.vii.1993; MURU, HA 930, 931). Old guano jetty, West Wallabi I., Wallabi Gp. From 1-3m. (J.M. Huisman, 14.iv.1991; MURU, HA 285). Dictyosphaeria versluysii Weber-van Bosse 1905: 144. Reference: Egerod 1952: 351-355, figs la, 2h-k. Type Locality: Indonesia. Distribution Widely distributed in warmer seas. Specimen: Jackson I., Pelsaert Gp. From 8-9m (G.T. Kraft & J.M. Huisman, 14.x.1990; MELU, K8647).

Genus: Valonia C. Agardh 1823(1822-1823): 428. Valonia macrophysa Ktitzing 1843: 307. Reference: Jaasund 1976: 13, fig. 28. Type Locality: Lessina [Hvar], Croatia. Distribution: Yugoslavia; Warmer waters of the Indo-Pacific region. Specimens: Coronation I., Pelsaert Gp. From Sm. (J.M. Huisman, 24.ix.1994; MURU, HA 875, 876). Long I., Wallabi Gp. (J.M. Huisman, 4.vii.1993; MURU, HA 913). South of Beacon I., Wallabi Gp. (J.M. Huisman, 8.vii.l993; MURU, HA 912).

Order Ulvales Family Ulvaceae

Genus: Ulva Linnaeus 1753: 1163 Ulva lactuca Linnaeus 1753: 1163. Reference: Womersley 1984: 141, figs 44A, 45A-C. Type Locality: In Oceano. Distribution: Cosmopolitan. Specimens: Pelsaert I., Pelsaert Gp. (J.M. Huisman, l.ix.1991; MURU, HA 1095). 186 J.M. HUISMAN

Division Phaeophyta Order Chordariales Family Chordariaceae

Genus: Cladosiphon Kutzing 1843: 329. Cladosiphonfilum (Harvey) Ky1in 1940: 29. Mesogloiafilum Harvey 1855b: 536. Reference: Womersley & Bailey 1987: 120-122, figs 35B, 36F, G, 37A. Type Locality: King George's Sound, Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Twofold Bay, New South Wales, and around Tasmania. Specimen: Turtle Bay, East Wallabi 1., Wallabi Gp. On Posidonia australis at 10m. (J.M. Huisman, 30.ix.1994; MURU, HA 458).

Order Dictyosiphonales Family Pnnctariaceae

Genus: Asperococcus Lamouroux 1813: 277. Asperococcus bullosus Lamouroux 1813: 277, pl. 12, fig. 5. References: Womersley 1987: 320, figs 114C, 116A,B, 117A. Type Locality: Mediterranean coast of France. Distribution: Widely distributed in temperate seas. Specimens: North-west of West Wallabi 1., Wallabi Gp. On Posidonia at 2-3 m. (J.M. Huisman, 30.ix.1994; MURU, HA 485). Turtle Bay, East Wallabi 1., Wallabi Gp. On Posidonia at 10m. (J.M. Huisman, 30.ix.1994; MURU, HA 471).

Order Dictyotales Family Dictyotaceae

Genus: Dictyopteris Lamouroux 1809b: 332. Dictyopteris australis (Sonder) Askenasy 1888: 30. Haliseris australis Souder 1853: 664. References: Womersley 1987: 222, figs 76A, 77A-G. Allender & Kraft 1983: 107, figs 17C,D 18C,D. Type Locality: Lefevre Peninsula, South Australia. Distribution: Probably Australia­ wide; India; Hawaiian Is. Specimens: The Nook, From 15-20 m. (J.M. Huisman & P Dingle, 3.xii.1988; MURU, HA 326). East Wallabi I., Wallabi Gp. From 5 m. (J.M. Huisman, 12.iv.1991; MURU, HA 325). Old guano jetty, West Wallabi 1., From 1-3m. (J.M. Huisman, 13.iv.1991; MURU, HA 215). Dictyopteris muelleri (Sonder) Reinbold 1899: 43. Haliseris muelleri Souder 1853: 665. References: Womersley 1987: 227, pl. 1, fig. 2, figs 78B, 79E-J. Fuhrer et al. 1981: 71, pis 112, 113. Harvey 1860: pl. 180. Type Locality: Lefevre Peninsula, South Australia. Distribution: North of Geraldton, Western Australia, to Port Jackson, New South Wales, Tasmania. Specimens: Old Guano Jetty, West Wallabi I. Wallabi Gp. From 1-3 m. (J.M. Huisman, 13.iv.1991; MURU, HA 211). Dictyopteris plagiogramma (Montagne) Vickers 1905: 58. Haliseris plagiogramma Montagne 1837: 356. Reference: Allender & Kraft 1983: 103, figs 17A,B, 18A,B. Type Locality: BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 187

Havana, Cuba. Distribution: Widespread in tropical seas. Specimens: Coral Patches, Pelsaert Gp. From 20m. (J.M. Huisman, 5.xii.1988; MURU, HA 327, 355). West side of Long I., Wallabi Gp. From 20m. (J.M. Huisman, 5.vii.1993; MURU, HA 328). Old Guano Jetty, West Wallabi I. Wallabi Gp. From 1-3m. (J.M. Huisman, 13.iv.1991; MURU, HA 207).

Genus: Dictyota Lamouroux 1809b: 331.

Dictyota ceylanica Kiitzing 1859: 11, t. 25, fig. 1. Reference: Jaasund 1976: 41, fig. 84. Type Locality: Sri Lanka. Distribution: Warmer waters of the Indo-Pacific. Specimens: Small Islet, Wallabi Gp. (J.M. Huisman, 27.ix.1994; MURU, HA 779). 'Anemone Lump', Eastern Passage, Easter Gp. (J.M. Huisman, 12.x.1990; MURU, HA 385). Coronation 1., Pelsaert Gp. (J.M. Huisman, 24.ix.1994; MURU, HA 889).

Dictyota ciliolata Kiitzing 1859: 12, t. 27, fig. 1. Reference: Kiitzing 1859: 12, t. 27, fig. 1. Type Locality: La Guayra, Venezuela. Distribution: Widely distributed in tropical and subtropical waters. Specimens: Traitors 1., Wallabi Gp. From 15m (J.M. Huisman, 6.vii.1993; MURU, HA 329). Nth-east Eastern Passage, Easter Gp. From 8-12 m. (J.M. Huisman, 26.ix.1994; MURU, HA 816). Coral Patches, Pelsaert Gp. (J.M. Huisman, 14.iv.l991; MURU, HA 195). Dictyota dichotoma (Hudson) Lamouroux 1809: 42. Ulva dichotoma Hudson 1762: 476. Reference: Womersley 1987: 194, figs 64H-M, 65A,B. Type Locality: Walney 1., Lancashire, England. Distribution: Almost cosmopolitan. Specimens: West of Long I., Wallabi Gp. (J.M. Huisman, 5.vii.1993; MURU, HA 341). North-east Eastern Passage, Easter Gp. From 15-20 m. (J.M. Huisman & T.H. Rose, 22.x.1988; MURU, HA 180). Dictyota dichotoma var. intricata (C. Agardh) Greville 1830: 58. Zonaria dichotoma (Hudson) C. Agardh var. intricata C. Agardh 1820: 134. Reference: Womersley 1987: 194- 195, fig. 65B. Type Locality (of variety): Cadiz, Spain. Distribution: Widespread. Specimen: 'Anemone Lump', Eastern Passage, Easter Gp. (J.M. Huisman, 12.x.1990; MURU, HA 386). Dictyota furcellata (C. Agardh) Greville 1830: xliii. Zonaria furcellata C. Agardh 1824: 266- 267. Reference: Womersley 1987: 196, figs 65C, 66A-C. Type Locality: Shark Bay, Western Australia. Distribution: Shark Bay, Western Australia, to Western Port, Victoria. Specimen: Turtle Bay, East Wallabi 1., Wallabi Gp. From 5 m. (J.M. Huisman, 3.vii.1993; MURU, HA 382).

Dictyota mertensii (Martius) Kiitzing 1859: 15, t. 36, fig. 1. Ulva mertensii Martius 1828: 5, pl. 1. Reference: Taylor 1960: 224, pl. 30, figs 4, 5 (as Dictyota dentata Lamouroux). Type Locality: 'ex oceano atlantica orientali ad Ins. Thome lectam'. Distribution: Houtman Abrolhos, Western Australia; warmer waters of the Atlantic Ocean. Specimens: Old Guano Jetty, West Wallabi 1., Wallabi Gp. From 1-3m. (J.M. Huisman, 13.iv.l991; MURU, HA 208). Suomi 1., Easter Gp. (J.M. Huisman, 12.x.1990; MURU, HA 381). Snowy's 1., Pelsaert Gp. (J.M. Huisman, 29.ix.1991; MURU, HA 344). Dictyota naevosa (Suhr) Montagne 1840 [1839-1841]: 145. Zonaria naevosa Suhn 1834: 723. Reference: Womersley 1987: 190, figs 63B, 64E. Type Locality: Algoa Bay, South Africa. Distribution: Houtman Abrolhos, Western Australia, to Port Willunga, South Australia; South Africa. Specimen: Mostyn's Lump, Pelsaert Gp. (G. T. Kraft & J.M. Huisman, 14.x.1990; MELU, K8590). 188 J.M. HUISMAN

Genus: Dilophus J. Agardh 1882: 106. Dilophus crinitus J. Agardh 1897: 99. Reference: Womersley 1987: 206, figs 69B, 70A-c. Phillips 1992: 665-666, fig. 1a. Type Locality: Rottnest 1., Western Australia. Distribution: Known from the Houtman Abrolhos and Rottnest Island, Western Australia. Specimens: Old Guano Jetty, West Wallabi 1., Wallabi Gp. From 1-3m. (J.M. Huisman, 13.iv.1991; MURU, HA 208). Jackson 1., Pelsaert Gp. (J.M. Huisman, 18.viii.1990; MURU, HA 255, 257). Dilophus fastigiatus (Sonder) J. Agardh 1882: 107. Dictyota fastigiata Sonder 1845: 50. Reference: Womersley 1987: 206-207, figs 70D-I. Phillips 1992: 666-671, figs 2-5. Type Locality: Western Australia. Distribution: From the Houtman Abrolhos, Western Australia, to Wilson's Promontory, Victoria. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. In seagrass beds at 10m. (J.M. Huisman, 27.ix.l986; MURU, HA 331). Dilophus robustus (J. Agardh) Womersley 1967: 213. Dictyota robusta J. Agardh 1894: 76. Reference: Womersley 1987: 202, figs 67B, 68A, B. Phillips 1992: 689-691, figs 19, 20, 21. Type Locality: Port Phillip Heads, Victoria. Distribution: From the Houtman Abrolhos, Western Australia, to Port Phillip Heads, Victoria. Specimens: Sth end of Goss Passage, Wallabi Gp. From 15m. (J.M. Huisman, 6.vii.l993; MURU, HA 332-334, 352). North of Morning Reef, Wallabi Gp. From 20m. (J.M. Huisman, 23.ix.l986; MURU, HA 335).

Genus: Distromium Levring 1940: 3. Distromiumjlabellatum Womersley 1967: 218, fig. 3. Reference: Womersley 1987: 230-232, figs SOB, 81E-I. Type Locality: Port Willunga, South Australia. Distribution: Houtman Abrolhos to Port Phillip, Victoria and Deal 1., Bass Strait. Specimens: Sth end of Goss Passage, Wallabi Gp. From 10m. (J.M. Huisman, 7.vii.1993; MURU, HA 357). West side of Long 1., Wallabi Gp. From 20m. (J.M. Huisman, 5.vii.1993; MURU, HA 359, 360).

Genus: Lobophora J. Agardh 1894: 21. Lobophora variegata (Lamouroux) Womersley 1967: 221. Dictyota variegata Lamouroux 1809a: 40. References: Womersley 1987: 255, figs 91F,G, 92A. Allender & Kraft 1983: 81, figs 4G-H, 5A-B. Type Locality: Antilles. Distribution: Tropical to warm temperate coasts in most seas. Specimens: 'Anemone Lump', Eastern Passage, Easter Gp. From 3 m. (J.M. Huisman & P Dingle, 4.xii.l988; MURU, HA 186). North of Beacon 1., Wallabi Gp. From 11-13 m. (J.M. Huisman, 12.iv.1991; MURU, HA 183).

Genus: Pachydictyon J. Agardh 1894: 81. Pachydictyon paniculatum (J. Agardh) J. Agardh 1894: 84. Dictyota paniculata J. Agardh 1841: 5. References: Womersley 1987: 211, figs 71D, 72F-J. Fuhrer et al. 1981: 70, pl. llO. Type Locality: Picton (Bunbury), Western Australia. Distribution: Geraldton and Houtman Abrolhos, Western Australia, to Sydney, New South Wales, Tasmania. Specimens: Old Guano Jetty, West Wallabi 1., Wallabi Gp. From 1-3m. (J.M. Huisman, 13.iv.l991; MURU, HA 209).

Genus: Padina Adanson 1763: 13. Padina boergesenii Allender & Kraft 1983: 87. Reference: Allender & Kraft 1983: 87-89, figs 6H, I, 7C, D. Type Locality: Danish West Indies. Distribution: Probably widespread in BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 189

warmer waters. Specimens: Beacon 1., Wallabi Gp. Intertidal (J.M. Huisman, 4.vii.l993; MURU, HA 374-376). Padina elegans Koh ex Womersley 1987: 220, figs 74B,C, 75K-M. Type Locality: Mudurup Reef, Cottesloe, Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Pearson 1., South Australia. Specimens: Turtle Bay, East Wallabi 1., Wallabi Gp. In seagrass beds at 10m. (J.M. Huisman, 27.x.l986; MURU, HA 371, 372). West Wallabi 1., Wallabi Gp. At 1-3m. (J.M. Huisman, 4.vii.l993; MURU, HA 216). Padina sanctae-crucis B¢rgesen 1914: 45-46, figs 27, 28. Reference: Womersley 1987: 219, to figs 74A, 75H-J. Type Locality: St Croix, West Indies. Distribution: West coast of Western In Australia, one specimen from Point Sinclair, South Australia; Tropics and subtropics of eastern Atlantic; Japan. Specimens: Gee Bank, Pelsaert Gp. On coral at 15m. (J.M. Huisman, 76. 22.i.1990; MURU, HA 193). North of Beacon 1., Wallabi Gp. At 10-15 m. (J.M. Huisman, 21. 12.iv.1991; MURU, HA 182). West side of Long 1., Wallabi Gp. From 20m. (J.M. Huisman, 5.vii.1993; MURU, HA 370). Padina tenuis Bory 1827: 590. Reference: Allender & Kraft: 1983: 83-85, figs 5D, E, 6A. of Type Locality: Mauritius. Distribution: Widespread in the Indo-Pacific and eastern Atlantic Specimens: Suomi 1., Easter Gp. Intertidal (J.M. Huisman, 14.iv.1991; MURU, HA 217). North of Leos 1., Easter Gp. (M.A. Borowitzka, 18.ix.1982; MURU, A-082).

32, Genus: Stypopodium (Kiitzing) J. Agardh 1894: 20. an Stypopodium australasicum (Zanardini) Allender & Kraft 1983: 94. Zonaria australasica ss Zanardini 1874: 487-488. Reference: Allender & Kraft 1983: 94-96, figs lOC-E, llA-C. of Type Locality: Lord Howe Island, Australia. Distribution: Houtman Abrolhos, Western Australia; Lord Howe Island. Specimen: Eastern Passage, Easter Gp. From 10-20 m. (J.M. Huisman & T.H. Rose, 23.x.1988; MURU, HA 1078). Stypopodium flabelliforme Weber-van Bosse 1913: 176. Reference: Allender & Kraft 1983: 96, figs llD-F, 12. Type Locality: Indonesia. Distribution: Indo-Pacific. Specimens: Mostyn's Lump, Pelsaert Gp. From 27m. (J.M. Huisman, ll.xi.1995; MURU, HA 1319).

Genus: Zonaria C. Agardh 1817: xx. Zonaria turneriana J. Agardh 1871: 438. Reference: Womersley 1987: 252-253, figs 90B, 91D, E. Type Locality: Warrington, Otago, New Zealand. Distribution: Houtman Abrolhos, Western Australia, to Port Phillip Heads, Victoria, and around Tasmania; New Zealand. Specimen: 'Anemone Lump', Eastern Passage, Easter Gp. From 15m (J.M. Huisman, 30.ix.l995; MURU, HA 1273).

Order Ectocarpales Family Ectocarpaceae

Genus: Hincksia Gray 1864: 12. in Hincksia mitchelliae (Harvey) Silva in Silva et al. 1987: 73. Ectocarpus mitchelliae Harvey 1852: 142, pl. XII. Reference: Womersley 1987: 52, figs 10D, 12E-G. (as Giffordia 190 J.M. HUISMAN mitchelliae). Distribution: Widespread in temperate and subtropical seas. Specimen: Pigeon Rock, West Wallabi I. (J.M. Huisman, 30.ix.1994; MURU, HA 1093).

Order Fucales Family Cystoseiraceae

Genus Caulocystis Areschoug 1854: 334. Caulocystis uvifera (C. Agardh) Areschoug 1854: 335. Sargassum uviferum C. Agardh 1824: 306. References: Womersley 1987: 359, fig. 129A. Fuhrer et al. 1981: 81, pl. 133. Womersley 1964: 101, fig. 45, pl. 15, fig. 2. Type Locality: Shark Bay, Western Australia. Distribution: Shark Bay, Western Australia, to Coo gee (Sydney), New South Wales; Norfolk I. Specimens: Pelsaert 1., Pelsaert Gp. On inner reef (H.B.S. Womersley, 1.ix.1947; ADU, A5873). South end of Goss Passage, Wallabi Gp. (J.M. Huisman, 6.vii.1993; MURU, HA 1075).

Genus Cystoseira C. Agardh 1820: 50. Cystoseira trinodis (Forsskiil) C. Agardh 1820: 67. Fucus trinodis Forsskal 1775: 192. References: Womersley 1987: 357, figs 128B, 131E,F. Papenfuss & Jensen 1967: 17, figs I, 2. Type Locality: Tor, Sinai Peninsula, Egypt. Distribution: Northern Australia around to Victor Harbour, South Australia; Red Sea; Indian Ocean; Indonesia. Specimens: Third Sister, Wallabi Gp. On reef flat (J.M. Huisman, 28.ix.1994; MURU HA 626). Old Guano Jetty, West Wallabi I.. (J.M. Huisman, 13.iv.1991; MURU HA 210).

Genus: Hormophysa Kutzing 1843: 359. Hormophysa cuneiformis (Gmelin) Silva in Silva et al. 1987: 81. Fucus cuneiformis Gmelin 1792: 1389. References: Womersley 1987: 356, figs 128A, 131C,D. Allender & Smith 1978: 61, fig. lA-C. (as Hormophysa triquetra). Type Locality: Suez, Egypt. Distribution: Widely distributed in the Indo-Pacific Region. Specimens: Small Islet, Wallabi Gp. From 12 m. (J.M. Huisman, 27.ix.1994; MURU, HA 777). 'Batavia' wreck site, Morning Reef, Wallabi Gp. Epilithic at 5 m. (J.M. Huisman, MURU, HA 1079).

Genus: Myriodesma Decaisne 1841: 148. Myriodesma quercifolium (Bory) J. Agardh 1848: 192. Lessonia quercifolia Bory 1826: 322; 1828: 79, pl. 4. Reference: Womersley 1987: 416, figs 154A, 156D, E. Type Locality: "du Sud de Nouv. Holl." Distribution: From the Houtman Abrolhos, Western Australia, to Port Elliot, South Australia. Specimens: Mostyn's Lump, Pelsaert Gp. From 20--24 m. (G.T. Kraft & J.M. Huisman, 4.x.1990; MELU). West of Zeewyk Passage. Dredged at 55 m (R.D. Royce, 12.v.1960; PERTH Royce 1830, 1848).

Genus Scaberia Greville 1830: xxxvi. Scaberia agardhii Greville 1830, synop.: xxxvi. References: Womersley 1987: 354, pl. 6, fig. 3, pl. 7, fig. 1, figs 131A,B. Fuhrer et al. 1981: 87, pl. 144. Lucas 1936: 76, fig. 44. Type Locality: Swan River Settlement, Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Bondi, New South Wales, northern Tasmania. Specimens: East Wallabi I., Wallabi Gp. From 5 m. (J.M. Huisman, 12.iv.1991; MURU, HA 1096). BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 191

Pigeon Family Sargassaceae

Genus: Sargassum C Agardh 1820: 1. by Gary A. Kendrick. CSIRO Division of Fisheries, PO Box 20, North Beach, Western Australia 6020. Sargassum boryi C. Agardh 1824: 308. Reference: Womersley 1954: 344, pl. 1, fig.l & 2, fig. la, b. (as Sargassum peronii (Mertens) C. Agardh). Type Locality: "Ad litus occidentale Novae Hollandiae". Distribution: From Rockingham, Western Australia, around northern Australia to Rockhampton, Queensland. Also reported from Aru Island and New Caledonia. Specimens: South end of Goss Passage, Traitors 1., Wallabi Gp. To 15 m. (J.M. Huisman, 6.vii.l993; MURU HA 1066). Small Islet, Wallabi Gp. From 12m. (J.M. Huisman, 27.ix.94; MURU, HA 784). Jackson 1., Pelsaert Gp. From 15 m. (G.A. Kendrick & J.M. Huisman, 30.ix.l991; MURU, HA 245). Sargassum decurrens (R. Brown ex Turner) C. Agardh 1820: 42. Fucus decurrens Brown ex Turner 1811: 142-143, pl. 194. Reference: Womersley 1987: 421, figs 157B, 160A. Type Locality: Northern Australia. Distribution: From Rottnest Island, Western Australia around 192. northern Australia to Keppel Bay, Queensland, with isolated occurrences at Wallaroo, Cowell and & Port Stanvac, Spencer Gulf, South Australia. Known also from New Caledonia. Victor Specimens: North of Leo 1., Easter Gp. (M.A. Borowitzka, 18.ix.l982; MURU, GAK 102). Wallabi Suomi 1., Easter Gp. To 12m. (J.M. Huisman & G.A. Kendrick, 28.ix.l991; MURU, HA 228, Wa!labi 229, 230, 231, 234, 235). Sargassum distichum Souder 1845: 51. Reference: Womersley & Scott 1987: 444, figs 167, 168F. Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia, around southern Australia to Port Phillip, Victoria. Specimens: Beacon 1., low intertidal coral Gmelin rubble habitat (A. Brearley, 14.vi.l994; MURU, GAK 112, 113, 114, 115). Jackson 1., Pelsaert 1978: Gp. From 12m. (J.M. Huisman & G.A. Kendrick, 30.ix.l991; MURU, HA 246). Sargassum fallax Sonder 1845: 52. Reference: Womersley 1987: 432, pl. 8, fig. 4, figs 161B, 162A, 164C-E. Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Rockingham Bay, Queensland. Specimens: Between Coronation Gp and Basile 1., Pelsaert Gp. Trawled (Keating, 24.viii. 1970; AD, A 43824). Small Islet, Wallabi Gp. From 12m. (J.M. Huisman, 27.ix.94; MURU, HA 782). Jackson 1., Pelsaert Gp. From 12m. (J.M. Huisman & G.A. Kendrick, 30.ix.l991; MURU, HA 248). Sargassum ligulatum C. Agardh 1824: 297. Reference: J. Agardh 1889: 88, tab. XXVI, III, fig. 13. Type Locality: West coast of Western Australia. Distribution: West coast of Western Australia. Specimens: Turtle Bay, East Wallabi 1., Wallabi Gp. From 10 m. (J.M. Huisman, Royce, 27.ix.l986; MURU, HA 178). East of Seal 1., Wallabi Gp. From 15-20 m. (J.M Huisman, 29.ix.l994; MURU, HA 561). Easter Gp. From 10m. (T Carruthers, 25.ix.l994; MURU, HA 834). South end of Goss Passage, Traitors 1., Wallabi Gp. To 15 m. (J.M. Huisman, 6.vii.93; MURU, GAK 118). Wallabi Gp. (P. Sladen Expedition, 1915; UWA, GAK 116, 117). I. 6, fig. Sargassum linearifolium (Turner) C. Agardh 1820: 24. Fucus linearifolius Turner 1809: . Type 105-106, pl. 111. Reference: Womersley & Scott 1987: 440, figs 165, 168B,C. Type Locality: "western coast of New Holland". Distribution: From Houtman Abrolhos, Western Australia around southern Australia to Rockingham Bay, Queensland. Specimens: East of Seal 1., Wallabi Gp. From 15-20 m. (J.M. Huisman, 29.ix.l994; MURU, HA 566). 192 J.M. HUISMAN

Sargassum podacanthum Sonder 1845: 51. Reference: Womersley & Scott 1987: 444, figs 167. 168E. Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Port Noarlunga, South Australia. Specimens: Goss Passage, Wallabi Gp. From 20m. (J.M. Huisman, 3.vii.1993; MURU, GAK 120). Sargassum spinuligerum Sonder 1845: 51. Reference: Womersley & Scott 1987: 442, figs 166A, 168D. Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia, around southern and eastern Australia to Cape York, Queensland. Specimens: Beacon 1., Wallabi Gp. (A. Brearley, 24.v.1994; MURU, GAK 121). Suomi 1., Easter Gp. From 3-12m. (J.M Huisman & G.A. Kendrick, 29.ix.1991; MURU, HA 232). Jackson I., Pelsaert Gp. From 12m. (J.M. Huisman & G.A. Kendrick, 30.ix.1991; MURU, HA 249). Sargassum tristichum Greville & C. Agardh ex Sonder 1845: 51. Reference: Womersley 1987: 436, figs 163A, 164H. Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Port Noarlunga, South Australia. Specimens: Beacon I., intertidal (A. Brearley, 24.v.1994; MURU, GAK119).

Genus Turbinaria Lamouroux 1825: 71. Turbinaria gracilis Sander 1845: 52. Reference: Taylor 1964: 480, pl. 3, figs 13-21. Type Locality: Western Australia. Distribution: Only known reliably from Western Australia (Taylor, 1964). Specimens: Burnette 1., Pelsaert Gp. On reef flat (J.M. Huisman, 24.ix.1994; MURU, HA 906-908). Pelsaert 1., Pelsaert Gp. (G.G. Smith, viii.1947; UWA Smith 196). Remarks: Turbinaria gracilis seems only marginally distinct from the more widespread T. conoides. The former is the earlier name and should be chosen if the two taxa prove to be conspecific.

Order Laminariales Family Alariaceae

Genus: Ecklonia Hornemann 1828: 388. Ecklonia radiata (C. Agardh) J. Agardh 1848: 146. Laminaria radiata C. Agardh 1817: xiii. References: Womersley 1987: 332, pl. 4, fig. 2, figs 120, 1211-K. Fuhrer et al. 1981: 74, pls 118,119. Lucas 1936: 95, fig. 52. Type Locality: "New Holland". Distribution: From Kalbarri, Western Australia, to Caloundra, Queensland, Tasmania, Lord Howe I. (although not in recent times, G.T. Kraft, pers. comm.); New Zealand; South Africa. Specimens: Sth end of Goss Passage, Wallabi Gp. From 3-5 m. (J.M. Huisman, 6.vii.1993; MURU, HA 1077). Goss Passage, Wallabi Gp. From 5 m. (J.M. Huisman, l.x.1994; MURU, HA 426).

Order Scytosiphonales Family Scytosiphonaceae

Genus: Colpomenia (Endlicher) Derbes & Solier in Castagne 1851: 95. Colpomenia peregrina Sauvageau 1927: 321. References: Womersley 1987: 298, figs 107B, BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 193

87: 444, figs 108G,H. Parsons 1982: 295, figs 6,7. Syntype Localities: Brittany, France. Distribution: Widespread in temperate regions. Probably throughout eastern, western and southern Australia. Specimens: Sth of Beacon I, Wallabi Gp. (J.M. Huisman, 8.vii.l993; MURU, HA 1076). Goss Passage, Wallabi Gp. From< 5 m. (J.M. Huisman, 3l.ix.l994; MURU, HA 392).

Genus: Hydroclathrus Bory de Saint-Vincent 1825: 419. Western Specimens: Hydroclathrus clathratus (C. Agardh) Howe 1920: 590. Encoelium clathratum C. Agardh . , Easter Gp. 1823[1822-1823]: 412. References: Womersley 1987: 300, figs 109A, llOA,B. Fuhrer et al . Jackson I., 1981: pl. 100. Type Locality: Uncertain. Distribution: Widely distributed in tropical to warm 249). temperate seas. Specimens: Nth of Beacon 1., Wallabi Gp. (J.M. Huisman, 28.ix.l994; MURU, HA 575).

Genus: Rosenvingea Borgesen 1914: 22. Rosenvingea orientalis (J. Agardh) Borgesen 1914: 26. Asperococcus orientalis J. Agardh 1848: 78. Reference: Jaasund 1976: 49, fig. 98. Type Locality: Manila, Philippine Islands. Distribution: Widely distributed in tropical to warm temperate seas. Specimens: Bynoe 1., Easter Gp. (J.M. Huisman, 10.xi.l995; MURU, HA 1331).

Order Sphacelariales Family Sphacelariaceae

Genus: Sphacelaria Lyngbye in Bornemann 1818: pl. 1600. Sphacelaria biradiata Askenasy 1894: 15, pl. 2, fig. 12. Reference: Womersley 1987: 162, figs SIB, 53A-G. Type Locality: "Adelaide", South Australia. Distribution: Houtman Abrolhos, Western Australia, to Walkerville, Victoria, Tasmania. Specimen: Mostyn's Lump, Pelsaert Gp. On crustose corallinaceae. (G.T. Kraft & J.M. Huisman, 14.x.l990; MELU, K8588). Sphacelaria novae-hollandiae Sonder 1845: 50. References: Womersley 1987: 158, figs 45E, SOA-H. Sauvageau 1901: 137, fig. 33. Type Locality: Western Australia (probably near Fremantle). Distribution: Houtman Abrolhos, Western Australia, to Port Stanvac, South Australia; Mauritius; tropical Pacific; western tropical Atlantic. Specimens: Third Sister, Wallabi Gp. Epiphytic on Turbinaria gracilis (J.M. Huisman, 28.ix.l994; MURU, HA 1046). not in recent end of Goss Sphacelaria rigidula Kiitzing 1843: 292. References: Womersley 1987: 166, figs 51D, 54A­ 1077). Goss G. Prud'homme van Reine 1982: 203, figs 508-554. Type Locality: Red Sea. Distribution: Cosmopolitan. Specimens: Pigeon Rock, West Wallabi 1., Wallabi Gp. From < 2 m. (J.M. Huisman, 30.ix.l994; MURU HA 1067).

Order Sporochnales Family Sporochnaceae

: 95. Genus: Austronereia Womersley 1987: 272. 298, figs 107B, Austronereia australis (Harvey) Womersley 1987: 273. Stilophora ? australis Harvey 1844b: 194 J.M. HUISMAN

453. Reference: Womersley 1987: 273, figs 97D, 98F-H. Type Locality: Georgetown Tasmania. Distribution: Houtman Abrolhos, Western Australia, to the Snowy River mouth: Victoria, and around Tasmania. Specimen: Coral Patches, Pelsaert Gp. (G. T. Kraft, 1l.xi.l995; MURU, HA 1326).

Genus: Encyothalia Harvey 1859: pl. LXII. Encyothalia cliftonii Harvey 1859: pl. LXII. Reference: Womersley 1987: 289-290, figs 104C, 105G-I. Type Locality: Fremantle, Western Australia. Distribution: Kalbarri, Western Australia, to Guichen Bay, South Australia, and Walkerville, Victoria. Specimen: Mostyn's Lump, Pelsaert Gp. From 27m. (J.M. Huisman, 1l.xi.1995; MURU, HA 1307).

Genus: Sporochnus C. Agardh 1817: xii. Sporochnus comosus C. Agardh 1824: 259. Reference: Womersley 1987: 280-282, figs 99D, 101F-J, 102A. Type Locality: "Ad Novam Hollandiam" [Australia]. Distribution: Houtman Abrolhos, Western Australia, around southern Australia and Tasmania to the Calliope River, Queensland. Specimen: Coral Patches, Pelsaert Gp. (G.T. Kraft, 1l.xi.1995; MURU, HA 1327).

Division Rhodophyta Class Bangiophyceae Order Porphyridiales Family Porphyridiaceae

Genus: Stylonema Reinsch 1875: 40. Stylonema alsidii (Zanardini) Drew 1956: 72. Bangia alsidii Zanardini 1840: 136. Reference: Womersley 1994: 24, fig. 1D, E. Type Locality: Trieste, Italy. Distribution: Virtually cosmopolitan. Specimen: East of Seal 1., Wallabi Gp. Epiphytic on Asteromenia peltata (J.M. Huisman, 29.ix.1994; MURU, HA 1081).

Class Florideophyceae Order Acrochaetiales Family Acrochaetiaceae

Genus: Audouinella Bory 1823: 340. Audouinella saviana (Meneghini) Woelkerling 1973: 560. Callithamnion savianum Meneghini 1840: 511. Reference: Woelkerling & Womersley 1994: 47-48, fig.7E, H. Type Locality: Cherbourg, France. Distribution: Nearly cosmopolitan. Specimen: Jackson I., Pelsaert Gp. (J.M. Huisman, 30.ix.1991; MURU, HA 1082). BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 195

wn, Order Bonnemaisoniales :outh, Family Bonnemaisoniaceae raft, Genus: Asparagopsis Montagne 1840: XV. Asparagopsis armata Harvey 1855b: 544. References: Lucas & Perrin 1947: 224, fig. 107. Levring 1953: 528. Harvey 1862: pl. 192. Type Locality: Garden I. or King George's Sound, figs Western Australia. Distribution: Australia; New Zealand; Mediterranean, western Europe. Specimens: Coral Patches, Pelsaert Gp. From 13m. (J.M. Huisman, 21.i.1990; MURU, HA 's 167). Asparagopsis taxiformis (Delile) Trevisan 1845: 45. Fucus taxiformis Delile 1813[1813- 1826]: 151, 295, pl. 57, fig. 2. Reference: Cribb 1983: 28, pl. 4, figs 1-2. Type Locality: Alexandria, Egypt. Distribution: Cosmopolitan in warmer seas. Specimens: Long I., Wallabi 99D, Gp. From 20m. (J.M. Huisman, 4.vii.1993; MURU, HA 979, 981). Nth of Leo I., Easter Gp. lman (M.A. Borowitzka, 18.ix.1982; MURU, HA 978). ver, HA Order Ceramiales Family Ceramiaceae

Genus: Acrothamnion J. Agardh 1892: 23. Acrothamnion preissii (Sonder) Wollaston 1968: 323, fig. 24. Callithamnion preissii Sonder 1845: 52. Type Locality: Rottnest I., Western Australia. Distribution: Champion Bay, Western Australia, to Port Campbell, Victoria; South Africa; Japan; Mediterranean; Philippines. Specimens: Traitors I., Wallabi Gp. On Rhodopeltis borealis (J.M. Huisman, 6.vii.1993; MURU, HA 1051).

Genus: Aglaothamnion Fe1dmann-Mazoyer 1941: 451. 'lee: :ally Aglaothamnion cordatum (B0rgesen) Fe1dmann-Mazoyer 1941: 459. Callithamnion .M. cordatum B0rgesen 1909: 10, figs 5-6. Reference: Price & Scott 1992: 75-76, fig 22A, B . Type Locality: Off Cruz bay, between St. Thomas and St. Jan, Virgin Islands. Distribution: Widely distributed in warmer waters. Specimens: Coral Patches, Pelsaert Gp. (J.M. Huisman, 24.ix.1994; MURU, HA 1052). Jackson I., Pelsaert Gp. (J.M. Huisman, 30.ix.1991; MURU, HA 1053).

Genus: Anotrichium Nageli 1862: 397. Anotrichium tenue (C. Agardh) Nageli 1862: 399. Griffithsia tenuis C. Agardh 1828: 131. Reference: Baldock 1976: 556, figs 59-64, 90. Type Locality: Venezia, Italy. Distribution: Widely distributed in all tropical and subtropical oceans except for the eastern Atlantic (Price & Scott, 1992). Specimens: Suomi I, Easter Gp. Intertidal. (J.M. Huisman, 14.iv.1991; £m MURU, HA 022):

I., Genus: Antithamnion Nageli 1847: 202. Antithamnion antillanum B0rgesen, 1917: 226, figs 213-216. Reference: Price & Scott, 1992: 196 J.M. HUISMAN

69-72, fig. 20A-C. Type Locality: In the Harbour near Charlotte Amalia, St. Thomas, Virgin Is. Distribution: Widespread in tropical seas. Specimens: Jackson 1., Pelsaert Gp. On Lobophora variegata. (J.M. Huisman, 14.x.l990; MURU, HA 1055). Antithamnion armatum (J. Agardh) De Toni 1903: 1398. Callithamnion armatum I. Agardh 1885: 3. Reference: Wollaston 1968: 290, fig. 18A-J. Type Locality: "Novae Hollandiae". Distribution: Houtman Abrolhos, Western Australia, to Kangaroo 1., South Australia. Specimens: Traitors 1., Wallabi Gp. (J.M. Huisman, 7.vii.1993; MURU, HA 1056). Antithamnion hanovioides (Sonder) De Toni 1903: 1398. Callithamnion hanovioides Sonder 1853: 674. Reference: Wollaston 1968: 295, fig. 19. Type Locality: St Vincent's Gulf, South Australia (Original specimen apparently lost - Sander's drawings and description in MEL). Distributon: Houtman Abrolhos, Western Australia to Wilson's Promontory, Victoria, Tasmania. Specimens: Mostyn's Lump, Pelsaert Gp. On Ecklonia radiata (J.M. Huisman, 29.ix.1991;MURU, HA 1054).

Genus: Carpothamnion Ktitzing 1849: 668. Carpothamnion gunnianum (Harvey) Ktitzing 1849: 668. Thamnocarpus gunnianus Harvey in Hooker 1844: pl. DCLXII. Reference: Wollaston 1992 (as Thamnocarpus gunnianus). Type Locality: Port Arthur, Tasmania. Distribution: From the Houtman Abrolhos, Western Australia to Phillip Island, Victoria, and Tasmania. Specimens: Sth end of Goss Passage, Wallabi Gp. From 15m. (J.M. Huisman, 6.vii.1993; MURU, HA 986). 'Batavia' wreck site, Wallabi Gp. From 7 m. (J.M. Huisman, 7.vii.1993; MURU, HA 984, 985).

Genus: Centroceras Ktitzing 1841: 731. Centroceras clavulatum (C. Agardh) Montagne 1846: 140. Ceramium clavulatum C. Agardh 1822: 2. Reference: Price & Scott 1992: 81-82, fig 25A-E. Type Locality: Callao, Peru. Distribution: Australia - widespread; World - widespread in warmer waters. Specimens: Nth of Beacon 1., Wallabi Gp. Epiphytic on Sargassum sp. (J.M. Huisman, 8.vii.1993; MURU, HA 1057). Snowy's 1., Pelsaert Gp. (J.M. Huisman, 29.ix.1991; MURU, HA 1058).

Genus: Ceramium Roth 1797: 146. Ceramium filicula Harvey ex Womersley 1978: 238. Reference: Womersley 1978: 238, figs 4E,F, 15A-E. Type Locality: Port Noarlunga, South Australia. Distribution: Houtman Abrolhos, Western Australia, to Port Phillip Heads, Victoria, Kiama to Terrigal, New South Wales Specimens: Jackson 1., Pelsaert Gp. On Dilophus sp. (J.M. Huisman, 18.viii.1990; MURU, HA 161). Ceramium flaccidum (Harvey ex Ktitzing) Ardissone 1871: 40. Hormoceras flaccidum Harvey ex Ktitzing 1862: 21. Reference: Womersley 1978: 234, figs 4A-D, 14E-H. Type Locality: Kilkee, Co. Clare, Ireland. Distribution: Probably cosmopolitan (Womersley 1978). Specimen: Snowy's 1., Pelsaert Gp. On Lomentaria sp. (J.M. Huisman, 29.ix.1991; MURU, HA 1059). Ceramium isogonum Harvey 1855b: 557. Reference: Womersley 1978: 227, figs 3A, 12; Price & Scott 1992: 95-97, fig. 29A-C. Type Locality: Garden 1., Western Australia. Distribution: Australia- widespread. Specimens: Jackson 1., Pelsaert Gp. On Laurencia sp. (J.M. Huisman, 30.ix.1991; MURU, HA 1060). BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 197

Ceramium macilentum J. Agardh 1894: 15. Reference: Womersley 1978: 232, figs 3E, 14A­ D. Type Locality: Port Phillip, Victoria. Distribution: Houtman Abrolhos, Western Australia, around southern Australia to the Great Barrier Reef, Queensland. Specimens: Jackson 1., Pelsaert Gp. On Hypnea sp. (J.M. Huisman, 14.x.1990; MURU, HA 1061). Ceramium mazatlanense Dawson 1950: 130. References: Dawson 1950: 130-132, pl. 2, figs 14, 15. Itono 1972: 82, fig. liB, C. Type Locality: Mazatlan, Sinaloa, Mexico. Distribution: Widely distributed in the tropical and sub-tropical Indo-Pacific. Specimens: Snowy's 1., Pelsaert Gp. Epiphytic on Dictyota sp. (J.M. Huisman, 29.ix.l991; MURU, HA 1063). Ceramium puberulum Sonder 1845: 52. Reference: Womersley 1978: 216, figs 1E,F, 6. Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Wilson's Promontory, Victoria, northern Tasmania. Specimen: Turtle Bay, East Wallabi 1., Wallabi Gp. On Amphibolis leaves at 10m. (J.M. Huisman, 30.ix.1994; MURU, HA 453) Ceramium shepherdii Womersley 1978: 212. Reference: Womersley 1978: 212, figs lA-B, SA-C. Type Locality: Four km south of Redcliff Point, northern Spencer Gulf, South Australia. Distribution: Houtman Abrolhos, Western Australia, around southern Australia to the Snowy River mouth, Victoria. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. Epiphytic on Amphibolis antarctica at 2-3m. (J.M. Huisman, 5.vii.1993; MURU, HA 1062). Ceramium sympodiale Dawson 1957: 121, fig. 27c-d. Reference: Price & Scott, 1992: 109- 110, fig. 35A-E. Type Locality: Rigili 1., Eniwetak Atoll, Marshall Islands. Distribution: Northern Australia; Solomon Is., Eniwetak Atoll; Hateruma I. (Ryukyu Archipelago) (Price & Scott, 1992). Specimens: Snowy's 1., Pelsaert Gp. (J.M. Huisman, 29.ix.1991; MURU, HA 1097).

Genus: Corallophila Weber-van Bosse 1923: 339. Corallophila huysmansii (Weber-van Bosse) R. Norris 1993: 396. Ceramium huysmansii Weber-van Bosse 1923: 322, fig. 115. Reference: Price & Scott 1992: 92-95, fig. 28A-E (as Ceramium huysmansii). Type Locality: Indonesia. Distribution: Warmer waters of the Indo­ Pacific. Specimen: Goss Passage, Wallabi Gp. On Acropora. (J.M. Huisman, l.ix.1994; MURU, HA 1065).

Genus: Dasyphila Sander 1845: 53. Dasyphila preissii Sonder 1845: 53. Reference: Wollaston 1977. Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Wilson's Promontory, Victoria, and northern Tasmania. Record: Wollaston 1977: 445. Specimen: Basile 1., (Aquinas College Expedition, 22.vii.l970; AD, A43832).

Genus: Drewiana Gordon 1972: 100. Drewiana nitella (Harvey) Gordon 1972: 101, figs 35, 60. Wrangelia nitella Harvey 1855b: 546. Reference: Harvey 1859: pl. CV (as Wrangelia nitella). Type Locality: Rottnest I., Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Port Phillip Bay, Victoria, Tasmania. Specimen: Eight kilometres east of North!.. Dredged from 37 m (R.D. Royce, 13.v.1960; PERTH, Royce 1912). 198 J.M. HUISMAN

Genus: Euptilocladia Wollaston 1968: 269. Euptilocladia spongiosa Wollaston 1968: 269. Reference: Wollaston 1968: 269-275, figs 13B-J, 14A-H, plate 4. Type Locality: Robe, South Australia. Distribution: Houtman Abrolhos, Western Australia, to Port Phillip Heads, Victoria. Specimen: 'Batavia' wreck site Morning Reef, Wallabi Gp. (J.M. Huisman, 7.vii.1993; MURU, HA 1070). '

Genus: Euptilota Kutzing 1847: 36. Euptilota articulata (J. Agardh) Schmitz 1896: 7. Ptilota articulata J. Agardh 1841: 36. References: Fuhrer et al. 1981: 54, pis 81, 82. Lucas & Perrin 1947: 338, fig. 164. Type Locality: "Ad oras Novae Hollandiae" (probably Fremantle, Western Australia). Distribution: Western Australia to Queensland; Japan; India. Specimens: Coral Patches, Pelsaert Gp. From 16m. (J.M. Huisman, 24.ix.1994; MURU, HA 844, 855). West of Zeewyk Passage. Dredged at 55 m (R.D. Royce, 12.v.1960; PERTH Royce 1818).

Genus: Gattya Harvey 1855b: 555. Gattyapinnella Harvey 1855b: 555. References: Wollaston 1968:247, figs 6-8. Type Locality: Rottnest 1., Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Port Phillip Heads, Victoria. Specimens: Turtle Bay, East Wallabi 1., Wallabi Gp. Epiphytic on Amphibolis antarctica and A. griffithii stems at 10 m. (J.M. Huisman, 30.ix.1994; MURU, HA 439, 455, 459).

Genus: Grijfithsia C. Agardh 1817: 28. Griffithsia ovalis Harvey 1855b: 559. Reference: Baldock 1976: 527-529, figs 19-21, 78. Type Locality: King George's Sound, Western Australia. Distribution: Western Australia and Spencer's Gulf, South Australia. Specimens: On Posidonia, Turtle Bay, East Wallabi I., Wallabi Gp (J.M. Huisman, 27.ix.1986; MURU, HA 1099).

Genus: Guiryella Huisman & Kraft 1992: 128. Guiryella repens Huisman & Kraft 1992: 128, figs 1-20. Reference: Huisman & Kraft 1992. Type Locality: 'Mostyns Lump', a submerged reef approximately six kilometres north of 'The Nook', Pelsaert Group, Houtman Abrolhos, Western Australia. Distribution: Confirmed collections have only been made from the type locality and Rottnest I. Sterile collections, possibly of this species, have been made as far south as Hamelin Bay, Western Australia. Specimens: Mostyn's Lump, Pelsaert Gp. (J.M. Huisman & G.T. Kraft, 14.x.1990; MELD, A38706-38728).

Genus: Haloplegma Montagne 1842: 258. Haloplegma preissii (Harvey) Montagne 1845: 149. Rhodoplexia preissii Harvey in W. Hooker 1844: pl. DCXIII. References: Fuhrer et al. 1981: 51, pl. 75. Lucas & Perrin 1947: 336, fig. 163. Harvey 1859: pl. 79. Type Locality: Swan River Colony, Western Australia. Distribution: Western and southern coasts of Australia, Tasmania. Specimens: 'Batavia' wreck site, Morning Reef, Wallabi Gp (J.M. Huisman, 7.vii.1993; MURU, HA 956, 957, 958). Eight kilometres east of North I. (R.D. Royce, 13.v.1960; PERTH Royce). BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 199

Genus: Lejolisia Barnet 1859: 80. Lejolisia aegagropila (J. Agardh) J. Agardh 1892: 126., pl. 2, figs 1-8. Callithamnion aegagropila J. Agardh 1876: 11. Reference: Gordon 1972: 139-143, figs 45, 46, 61C, 63. Type Locality: New Holland. Distribution: Houtman Abrolhos to Point D'Entrecasteaux, Western Australia; Venus Bay, South Australia, to Point Roadknight, Victoria. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. Epiphytic on Amphibolis (J.M. Huisman, 30.ix.l994; MURU, HA 1064).

Genus: Monosporus Solier in Castagne 1845: 242. Monosporus indicus B¢rgesen 193la: 12, fig. 8. Reference: Huisman & Kraft 1982: 189, fig. 38. Type Locality: Bombay, India. Distribution: Indo-Pacific, in warmer waters. Specimens: Mostyn's Lump, Pelsaert Gp. (J.M. Huisman, 29.ix.l991; MURU, HA 1069). Dredged Genus: Perischelia J. Agardh ex Kylin 1956: 397. Perischelia glomulifera (J. Agardh) J. Agardh ex Kylin 1956: 397. Thamnocarpus ? glomulifer J. Agardh 1885: 6-9. Reference: Kylin 1956: 397, fig. 311B. Type Locality (syntypes): Champion Bay, Western Australia, and Port Phillip Heads, Victoria. Distribution: South-west Australia; South Africa. Specimen: West of Zeewyk Passage. Dredged from 55 m on (R.D. Royce, 12.v.l960; PERTH, Royce 1835). MURU, Genus: Pleonosporium Nageli 1862: 326, 339. Pleonosporium caribaeum (B¢rgesen) R. E. Norris 1985: 61. Mesothamnion caribaeum B¢rgesen 1917: 208. Reference: Norris 1985. Type Locality: St. John, off Annaberg, Danish West Indies (C). Distribution: Widely distributed in tropical and subtropical seas. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. On Halimeda cuneata (J.M. Huisman, 7.vii.l993; MURU, HA 1071).

Genus: Seirospora Harvey 1846: 1. Seirospora orientalis Kraft 1988a: 2. Reference: Kraft 1988a: 1-11, figs 2-25. Type Locality: One Tree island, Capricorn Group, Great Barrier Reef, Queensland, Australia. Distribution: Known from the Capricorn Group, Queensland, and the Houtman Abrolhos and Montebello Islands, Western Australia. Specimens: Traitor's I., Wallabi Gp. On Galaxaura rugosa (l.M. Huisman, 6.vii.1993; MURU, HA 1072).

Genus: Spyridia Harvey 1833: 259, 336. Spyridia filamentosa (Wulfen) Harvey 1833: 337. Fucus filamentosus Wulfen 1803: 64. Reference: Womersley & Cartledge 1975: 222, figs 1, 3A,B. Type Locality: Adriatic Sea (location unknown). Distribution: Australia-wide; Common in most seas. Specimens: Sth of Beacon I., Wallabi Gp. (J.M. Huisman, 8.vii.1993; MURU, HA 1073).

Genus: Tanakaella Itono 1977: 46. Tanakaella itonoi Huisman & Gordon-Mills 1994: 82. Reference: Huisman & Gordon-Mills 1994. Type Locality: Elliston Bay, South Australia. Distribution: Known from four localities 200 J.M. HUISMAN in South Australia (Egg Island, Isles of St Francis, Elliston Bay, Wedge Island, and Schnapper Point, Port Lincoln) and Rottnest Island and the Houtman Abrolhos, Western Australia. Specimens: 'Mostyns Lump', Pelsaert Gp. From 20-24 m. on Kallymenia crib rosa (J.M. Huisman & G.T. Kraft, 14.x.l990; MELU, 040394-040401).

Genus: Trithamnion Wollaston 1968: 388. Trithamnion gracilissimum Wollaston 1968: 389. Reference: Wollaston 1968: 389-, figs 38 I-P. Type Locality: Saunder's Beach, Kangaroo I., South Australia. Distribution: Houtman Abrolhos and Albany, Western Australia, to Port Willunga and Kangaroo I., South Australia. Specimen: Mostyn's Lump, Pelsaert Gp. Epiphytic on Webervanbossea splachnoides (G.T. Kraft & J.M. Huisman, 14.x.l990; MELU, K8623).

Genus: Wrangelia C. Agardh 1828: 136. Wrangelia plumosa Harvey 1844b: 450. Reference: Gordon 1972: 21-27, figs 4, 5, lOG, H, J, 51. Type Locality: Georgetown, Tasmania. Distribution: From the Houtman Abrolhos, Western Australia, to Port Stephens, New South Wales and Tasmania. Specimen: Coral Patches, Pelsaert Gp. From 16m. (J.M. Huisman, 24.ix.l994; MURU, HA 839).

Family Dasyaceae

Genus: Dasya C. Agardh 1824: 211. Dasya iyengarii B¢rgesen 1937: 345, figs 16, 17. Reference: Price & Scott 1992: 154-156, fig. 53A-D. Type Locality: Pamaban Bridge, South India. Distribution: Houtman Abrolhos, Western Australia; Queensland; New South Wales; Marshall Islands; southern India. Specimens: Near Pigeon Rock, West Wallabi I., Wallabi Gp. (J.M. Huisman, 30.ix.l994; MURU, HA 506, 515). Dasya pilosa (Weber-van Bosse) Millar 1990: 433. Dasyopsis pilosa Weber-van Bosse 1923: 377, fig. 137. Reference: Millar 1990: 433-434, fig 59D-G. Type Locality: Ceram Sea, New Guinea. Distribution: Tropical to temperate seas in the Indo-Pacific. Specimen: 'Anemone Lump', Eastern Passage, Easter Gp. From 12m. (J.M. Huisman, 20.i.l990; MURU, HA 069).

Family Delesseriaceae

Genus: Acrosorium Zanardini ex Ktitzing 1869: 4. Acrosorium decumbens (J. Agardh) Kylin 1929: 10, pl. 8, fig. 18. Nitophyllum decumbens J. Agardh 1876: 458. Reference: Millar 1990: 414, fig. 51A-C. Type Locality: New Zealand. Distribution: Houtman Abrolhos, Western Australia; New South Wales; New Zealand. Specimen: Traitors I., Wallabi Gp. (J.M. Huisman, 7.vii.l993; MURU, HA 1091). Remarks: The present specimens are identical to those described by Millar (1990), including the decumbent habit with multicellular rhizoids arising from the blade surface and margins.

Genus: Claudea Lamouroux 1813: 121. Claudea elegans Lamouroux 1813: 122. Reference: Norris 1987b. Harvey 1844a. Type BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 201

Locality: Australia. Distribution: Houtman Abrolhos, Western Australia; Southern Australia; Malaysian Archipelago; Brazil. Specimen: Turtle Bay, East Wallabi 1., Wallabi Gp. On scallop shells at 10m.(/. McKernan, .vii.1993; MURU, HA 1092).

Genus: Cottoniella B¢rgesen 1919: 333. Cottoniella filamentosa (Howe) B¢rgesen 1920: 478. Sarcomenia filamentosa Howe 1905: 571. Reference: Borgesen 1920: 478. Type Locality: Biscayne Key, Florida, USA. Distribution: Apparently widely but sporadically distributed in warmer seas. Specimen: Goss Passage, Wallabi Gp. Epilithic (J.M. Huisman, 31.ix.1994; MURU, HA 407). Remarks: The present specimens conform with variety fusiformis (B¢rgesen) Cormaci & Furnari (1987: 756).

Genus: Haraldiophyllum Zinova 1981. Haraldiophyllum erosum (Harvey) Millar & Huisman 1996. Nitophyllum erosum Harvey 1859: pl. XCIV. Reference: Millar & Huisman 1996. Type Locality: Garden Island, Western Australia. Distribution: From the Houtman Abrolhos, Western Australia, around southern Australia to Western Port. Specimens: Wallabi Gp. (Percy Sladen Expedition, NSW). Record: Lucas 1926: 600 (as Nitophyllum erosum).

Genus: Hemineura Harvey 1849 [1847-1849] Hemineurafrondosa (J. Hooker & Harvey) Harvey 1849 [1847-1849]: 116-117. Delesseria frondosa J. Hooker & Harvey 1847: 403. References: Fuhrer et al. 1981: 29, pl. 32. Lucas & Perrin 1947: 232, fig. 95. Harvey 1860: pl. 179 (as Delesseria frondosa). Type Locality: Tasmania. Distribution: Western and southern coasts of Australia, Tasmania. Specimens: Coral Patches, Pelsaert Gp. (J.M. Huisman, ll.xi.1995; MURU, HA 1325).

Genus: Heterodoxia J. Agardh 1898: 127. 923: New Heterodoxia denticulata (Kuntze) J. Agardh 1898: 131. Membranoptera denticulata Harvey one 1891: 904. References: Fuhrer et al. 1981: 29, pl. 31. Harvey 1863: pl. CCXLIV (as Delesseria denticulata). Type Locality: Rottnest Island, Western Australia. Distribution: South-west and southern Australia. Specimen: Old Guano Jetty, West Wallabi 1., Wallabi Gp. From 1-3m. (J.M. Huisman, 13.iv.1991; MURU, HA 037).

Genus: Hypoglossum Kiitzing 1843: 444. Hypoglossum caloglossoides Wynne & Kraft 1985: 15. Reference: Wynne & Kraft, 1985: 9- 19, figs 1-19. Type Locality: South Passage, Lord Howe Island, New South Wales. Distribution: Northern Australia, Samoa, Marshall Islands. Specimens: Long 1., Wallabi Gp. (J.M. Huisman, 4.vii.1993; MURU, HA 1083). Hypoglossum revolutum (Harvey) J. Agardh 1898: 188. Delesseria revoluta Harvey 1855b: 548. References: Womersley & Shepley 1982: 323, figs 1A, 3. Lucas & Perrin 1947: 228, fig. 91. Type Locality: King George's Sound, Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Portland Bay, Victoria. Specimens: Turtle Bay, East Wallabi 1., Wallabi Gp. On stems of Amphibolis antarctica at 10 m. (J.M. Huisman, 30.x.1994; MURU, HA 458, 460, 463). 202 J.M. HUISMAN

Genus: Martensia Hering 1841: 92. Martensia australis Harvey 1855b: 537. Reference: Millar 1990: 416-417, figs 52A-C. Type Locality: King George's Sound, Western Australia. Distribution: Western, southern and eastern Australia. Specimen: Mostyn's Lump, Pelsaert Gp. (J.M. Huisman, 29.ix.l991· MURU, HA 962). Remarks: The single specimen is attributed to M. australis on the basis of its large, course thallus, but may well be a form of M. fragilis Harvey. Martensiafragilis Harvey 1854: 145. Reference: Millar I990: 418-420, figs 53C-E. Type Locality: Belligam Bay, Sri Lanka. Distribution: Probably pan-tropical (Millar, I990). Specimens: Nth of Beacon 1., Wallabi Gp. From 15 m. (J.M. Huisman, 6.vii.1993; MURU, HA 970). Nth of Morning Reef, Wallabi Gp. From 20m. (J.M. Huisman, 28.ix.I986; MURU, HA 971). Suomi 1., Easter Gp. (J.M. Huisman, I4.iv.I99I; MURU, HA 016). Pelsaert Gp. (J.M. Huisman & P. Dingle, 3.xii.l988; MURU, HA 972). Remarks: Several of the Houtman Abrolhos specimens conform to the description of M. pavonia (J. Agardh) J. Agardh as given by Price & Scott (I992). This species was included in the synonymy of M. fragilis by Millar (I990).

Genus: Platysiphonia B¢rgesen 1931b: 28. Platysiphonia corymbosa (J. Agardh) Womersley & Shepley 1959: 209. Sarcomenia corymbosa J. Agardh 1896: 134. Reference: Womersley & Shepley, 1959: 182-185, figs 43- 50, pl. 2, fig. l.(as Sarcomenia corymbosa). Type Locality: Western Port, Victoria. Distribution: Known from a single collection from the Houtman Abrolhos, Western Australia. Otherwise Sturt Bay, South Australia, to Phillip I., Victoria, and northern Tasmania. Specimen: Old Guano Jetty, West Wallabi 1., Wallabi Gp. (J.M. Huisman, 13.iv.1991; MURU, HA 015, 032). Platysiphonia delicata (Clemente) Cremades in Cremades & Perez-Cirera 1990: 492. Conferva delicata Clemente 1807: 322. Reference: B¢rgesen, 1931b: 21-29, figs I-5; Ballantine & Wynne, 1985: 461-463, figs 7, 8 (as Platysiphonia miniata (C. Agardh) B¢rgesen. Type Locality: Sanlucar de Barrameda, Cadiz, Spain. Distribution: Widely distributed. Specimens: Jackson 1., Pelsaert Gp. (J.M. Huisman, 30.ix.1991; MURU, HA I 049). Remarks: This species is more widely known as Platysiphonia miniata (C. Agardh) B¢rgesen. Platysiphonia marginalis Wynne, Millar & Kraft 1984: 273. Reference: Wynne, Millar & Kraft 1984: 273-279, figs 2-22. Type Locality: South Passage, Lord Howe Island. Distribution: Houtman Abrolhos, Western Australia; New South Wales; Lord Howe Island. Specimen: Turtle Bay, East Wallabi 1., Wallabi Gp. On Amphibolis antarctica at 10m. (J.M. Huisman, 5.vii.l993; MURU, HA 1050).

Genus: Sarcomenia Sander 1845: 56. Sarcomenia delesserioides Sonder 1845: 56. Reference: Womersley & Shepley 1959: I7I­ I76, figs 1-19, pl. I, fig. 1. Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia to Western Port, Victoria. Specimens: Long 1., Wallabi Gp. From 20m. (J.M. Huisman, 5.vii.1993; MURU, HA I019). Eastern Passage, Easter Gp. From 10-- 20m. (J.M. Huisman & T.H. Rose, 23.x.l988; MURU, HA 048). Coral Patches, Pelsaert Gp. From 13m. (J.M. Huisman, 21.i.I990; MURU, HA 1017). 203 BENTHIC ALGAE OF THE HOUTMAN ABROLHOS

Family Rhodomelaceae

Genus: Acanthophora Lamouroux 1813: 132. Acanthophora dendroides Harvey 1855b: 538. Reference: Kraft 1979: fig. 7. Type Locality: Rottnest I., Western Australia. Distribution: Western Australia, Queensland, New South Wales. Specimens: Goss Passage, Wallabi Gp. From 30m. (J.M. Huisman, 3l.ix.1994; MURU, HA 409). Gee Bank. From 20-22 m. (J.M. Huisman & G.A. Kendrick, 3.x.1991; MURU, HA 019). The Nook, Pelsaert Gp. From 10-20 m. (J.M. Huisman & TH. Rose, 24.x.l988; MURU, HA 124). Acanthophora spicifera (Vahl) Bprgesen 1910: 201. Fucus spiciferus Vahl 1802: 44. Reference: Cribb 1983: 105-106, pl. 32, fig. 2. Type Locality: St. Croix, Virgin Islands. Distribution: Widely distributed in tropical waters. Specimens: Old Guano Jetty, West Wallabi 1., Wallabi Gp. 1-3 m. (J.M. Huisman, 13.iv.1991; MURU, HA 014). North-west of West Wallabi 1., Wallabi Gp. <2m. (J.M. Huisman, 30.ix.1994; MURU, HA 493).

Genus: Chondria C. Agardh 1817: xviii. Chondria curdieana (Harvey ex J. Agardh) Falkenberg 1901: 720, 748. Chondriopsis curdieana Harvey ex J. Agardh 1892: 152. Reference: Gordon-Mills & Womersley 1987: 497- 505, figs 1C, D, 5, 6, 7. Type Locality: 'S. Australia.' Distribution: Isolated occurrences from the Houtman Abrolhos to Cockburn Sound, Western Australia. More common along the south­ east coast and northern and eastern Tasmania (Gordon-Mills & Womersley 1987). Specimen: North-west of West Wallabi I., Wallabi Gp. From 1-2m. (J.M. Huisman, 30.ix.1994; MURU, HA 1041). Chondria dangeardii Dawson 1954: 460. Chondria platycladia Dangeard 1952: 303. Reference: Price & Scott 1992: 165-167, fig. 57A-D. Type Locality: Cape Verde, Senegal. Distribution: Houtman Abrolhos, Western Australia, and Queensland; Vietnam; Senegal; Ghana. Specimen: Coral Patches, Pelsaert Gp. (J.M. Huisman, ll.xi.1995; MURU, HA 1330). Chondria lanceolata Harvey 1855b: 539. Reference: Gordon-Mills & Womersley 1987: 544- 547, figs 23F, 24A, B, 25. Type Locality: Rottnest Island, Western Australia. Distribution: From the Houtman Abrolhos to Point Peron, Western Australia, and Scott Bay, South Australia. Specimen: Nth of Beacon I., Wallabi Gp. (J.M. Huisman, 28.ix.1994; MURU, HA 1040).

Genus: Dasyclonium J. Agardh 1894: 80. Dasyclonium flaccidum (Harvey) Kylin 1956: 534. Polyzonia flaccida Harvey 1855b: 539. References: Scagel 1962: 1024, figs 4, 32-34. Lucas & Perrin 1947: 288, fig. 134 (as Euzoniella flaccida). Type Locality: King George's Sound. Distribution: Western, southern and eastern Australia. Specimens: Nth-west of Leos I., Easter Gp. (J.M. Huisman, 28.ix.1991; MURU, HA 1090). Coral Patches, Pelsaert Gp. (J.M. Huisman, 2l.i.1990; MURU, HA 1089). <'D Dasyclonium incisum (J. Agardh) Kylin 1956: 534. Polyzonia incisa J. Agardh 1841: 24-25. Reference: Millar 1990: 458-459, figs 69A, B. Type Locality: "ad oras Novae Hollandiae". p. Distribution: Throughout Australia; New Zealand; India; South Africa. Specimen: Old Guano Jetty, West Wallabi I., Wallabi Gp. From 1-3m. (J.M. Huisman, 13.iv.1991; MURU, HA 001). 204 J.M. HUISMAN

Genus: Dictyomenia Greville 1830: 1. Dictyomenia sonderi Harvey 1858: pl. 21. References: Lucas & Perrin, 1947: 280, fig. 12? Falkenberg, 1901: 285, pl. 19, figs 13-16. Type Locality: Garden 1., Western Australia: Distribution: Western Australia. Specimens: Old Guano Jetty, West Wallabi 1., Wallabi Gp. From 1-3m. (J.M. Huisman, 13.iv.1991; MURU, HA 040). Dictyomenia tridens (Mertens ex Turner) Greville 1830: li (synop.). Fucus tridens Mertens ex Turner 1815-1819: 142-143. References: Lucas & Perrin 1947: 281, fig. 128. Fuhrer et al. 1981: 30, pl. 34. Type Locality: New Holland. Distribution: Southern and south-west Australia. Specimens: Turtle Bay, East Wallabi 1., Wallabi Gp. From 10 m. (l.M. Huisman 27.ix.1986; MURU, HA 1037). '

Genus: Ditria Hollenberg 1967: 206. Ditria expleta Huisman 1994: 2. Reference: Huisman 1994: 1-9. Type Locality: Goss Passage, adjacent to Beacon Island, Wallabi Gp, Houtman Abrolhos. Distribution: Known from the Houtman Abrolhos and Rottnest Island, Western Australia. Specimen: Goss Passage, Wallabi Gp. Epiphytic on Lobophora variegata at 15m. (J.M. Huisman, 13.vii.1993; MURU, HA 313a).

Genus Doxodasya (Schmitz) Falkenberg 1901: 537. Doxodasya bolbochaete (Harvey) Falkenberg 1901: 538. Dasya bolbochaete Harvey 1844b: 434. Reference: Parsons 1975: 659, figs 30, 31,46A. Type Locality: Georgetown, Tasmania. Distribution: Houtman Abrolhos, Western Australia, to Western Port, Victoria, and northern Tasmania. Specimens: Between 'Rat' (=Easter) & Pelsaert Groups, dredged from 45 m. depth, (Percy Sladen Expedition, Nov. 1915, UWA, A904).

Genus: Endosiphonia Zanardini 1878: 35. Endosiphonia spinuligera Zanardini 1878: 35. References: Falkenberg 1901: 571-573, pl. 13, fig. 12; Dawson 1956: 58, fig. 61. Type Locality: Wokam 1., Aru Is., Indonesia. Distribution: Indonesia; Philippines; Marshall Is.; Northern Australia; Lord Howe I. Specimens: West of Long 1., Wallabi Gp. (J.M. Huisman, 4.xii.1993; MURU, HA 959, 960, 961). Post Office I., Pelsaert Gp. (J.M. Huisman, MURU, HA 011).

Genus: Herposiphonia Nageli 1846: 238. Herposiphonia secunda (C. Agardh) Ambronn 1880: 197. Hutchinsia secunda C. Agardh 1824: 149. Reference: Millar, 1990: 451-452, figs 68A-C. Type Locality: Sicily, Mediterranean. Distribution: Widespread in warmer waters. Specimens: Turtle Bay, East Wallabi 1., Wallabi Gp. Epiphytic on Amphibolis antarctica (l.M. Huisman, 5.vii.1993; MURU, HA 1087).

Herposiphonia secunda (C. Agardh) Ambronn forma tenella (C. Agardh) Wynne 1985: 173. Hutchinsia tenella C. Agardh 1828: 105. Reference: Wynne 1985: 173, 175, figs 11, 12. Type Locality: Sicily. Specimen: Turtle Bay, East Wallabi 1., Wallabi Gp. Epiphytic on Caulerpa cupressoides (J.M. Huisman, 5.vii.1993; MURU, HA 1088). BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 205

Genus: Heterostroma Kraft & Wynne 1992: 17. Heterostroma nereidiis Kraft & Wynne 1992: 18. Reference: Kraft & Wynne 1992. Type 7. Locality: Yanchep, Western Austalia. Distribution: Known from the type locality and the Pelsaert Group, Houtman Abrolhos. Specimens: Mostyn's Lump (= Huisman's Pinnacle in Kraft & Wynne, 1992), Pelsaert Gp. (G.T. Kraft & J.M. Huisman, 14.x.1990; MELU, K17005-17012).

Genus: ]eannerettia Hooker & Harvey in Harvey 1847[1847-1849]: 20, t. 4.

]eannerettia lobata Hooker & Harvey in Harvey 1847[1847-1849]: 20, t. 4. Reference: Fuhrer et al. 1981: 31, pl. 36. Type Locality: Port Arthur, Tasmania. Distribution: Southern and south-west Australia. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. In seagrass beds at 10m. (J.M. Huisman, 30.ix.1994; MURU, HA 475. 27.ix.1986; MURU, HA 973). ]eannerettia pedicellata (Harvey) Papenfuss 1942: 448. Reference: Pollexfenia pedicellata Harvey 1844b: 431-432. Fuhrer et al. 1981: 31, pl. 35. Type Locality: Near Georgetown, Tasmania. Distribution: Southern and south-west Australia. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. In seagrass beds at 10m. (J.M. Huisman, 30.ix.1994; MURU, HA 475).

Genus: Kuetzingia Sander 1845: 54. Kuetzingia canaliculata (Greville) Sander 1845: 54. Rytiphlaea canaliculata Greville 1831: 149. Reference: Falkenberg 1901: 451-454, t. 7, 30-36. Harvey 1847: 23-24, t. 9. Type Locality: Swan River Settlement, Western Australia. Distribution: South-west Western Australia. Specimens: Turtle Bay, East Wallabi I. In seagrass beds at 10 m. (J.M. Huisman, 27.ix.1986; MURU, HA 1012).

Genus: Laurencia Lamouroux 1813: 130. Laurencia brongniartii J. Agardh 1841: 20. Reference: Saito & Womersley 1974: 839, figs 4C, D, 20, 21. Type Locality: Martinique (West Indies). Distribution: Point Peron, Western Australia, around northern Australia to Mossy Point and Lord Howe I., New South Wales, isolated records in South Australia. West Indies; Indonesia; Japan; New Caledonia; South Africa. Specimens: Goss Passage, Wallabi Gp. From 30m. (J.M. Huisman, l.x.1994; MURU, HA 418). Laurencia cruciata Harvey 1855b: 544. Reference: Saito & Womersley 1974: 843-845, figs 5C, 24. Type Locality: Rottnest Island, Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Outer Harbour (Port Adelaide), South Australia, and possibly Victoria. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. On Amphibolis stems at 10 m. (J.M. Huisman, 27.ix.1986; MURU, HA 143). Laurencia filiformis (C. Agardh) Montagne 1845: 125. Chondria filiformis C. Agardh 1822[1822-1823]: 358. Reference: Saito & Womersley 1974: 832, figs 3C,D, 14-16. Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Tilba, New South Wales, Tasmania; New Zealand. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. From 10m (J.M. Huisman, 27.ix.1986; MURU, HA 074). Laurencia majuscula (Harvey) Lucas in Lucas & Perrin 1947: 249. Laurencia obtusa var. 206 J.M. HUISMAN majuscula Harvey 1863, synop.: 26. Reference: Saito & Womersley 1974: 819, figs lA, 6. Type Locality: Rottnest I., Western Australia. Distribution: Australia-wide; Widely distributed in tropical, subtropical and temperate Pacific and Indian Oceans. Specimen: North of Beacon I., Wallabi Gp. From 11-13m (J.M. Huisman, 12.iv.l991; MURU, HA 009). Laurencia papillosa (C. Agardh) Greville 1830: Iii. Chondria papillosa C. Agardh 1822[1822-1823]: 344. Reference: Nam & Saito 1991. Type Locality: Mokha, Yemen. Distribution: Widely distributed in warmer seas. Specimens: Third Sister, Wallabi Gp. Shallow (J.M. Huisman, 28.ix.l994; MURU, HA 631).

Genus: Lenormandiopsis Papenfuss 1967: 102. Lenormandiopsis latifolia (Harvey & Greville) Papenfuss 1967: 103. Lenormandia latifolia Harvey & Greville in Harvey 1847 [1847-1849]: 19. Reference: Norris 1987a: 82-83, figs 12- 15. Distribution: South-west Australia. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. (J.M. Huisman, 30.ix.1994; MURU, HA 466). West of Zeewyk Passage. Dredged at 55 m (R.D. Royce, 12.v.l960; PERTH Royce 1838, 1842).

Genus: Leveillea Decaisne 1839: 375. Leveillea jungermannioides (Hering & Martens) Harvey 1855b: 539. Amansia jungermannioides Hering & Martens in Martens & Hering 1836: 485. Reference: Price & Scott, 1992: 196-198, fig 71A, B. Type Locality: Tor, Sinai Peninsula, Egypt. Distribution: Widely distributed in tropical and subtropical Indo-west Pacific. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. (J.M. Huisman, 30.ix.1994; MURU, HA 1085).

Genus: Lophocladia Schmitz 1893: 222. Lophocladia harveyi (Kiitzing) Schmitz 1893: 223. Dasya harveyi Kiitzing 1864: 26, pl. 71: figs e, f. Reference: Kiitzing 1864: 26, pl. 71 (as Dasya harveyi). Type Locality: Fremantle, Western Australia. Distribution: South-western Australia. Specimen: Nth-east Eastern Passage, Easter Gp. (J.M. Huisman, 26.ix.l994; MURU, HA 807).

Genus: Lophosiphonia Falkenberg in Schmitz & Falkenberg 1897: 459. Lophosiphonia prostrata (Harvey) Falkenberg 1901: 501. Polysiphonia prostrata Harvey 1855b: 540. Reference: Millar 1990: 452. Type Locality: Fremantle, Western Australia. Distribution: Known from the Perth region and the Houtman Abrolhos, Western Australia; south-east Queensland; Lord Howe Island and Coffs Harbour, New South Wales; Hawaii. Specimens: Goss Passage, Wallabi Gp. On Lobophora variegata at 20 m. (J.M. Huisman, 3.vii.1993; MURU, HA 994).

Genus: Neurymenia J. Agardh 1863[1851-1863]: 1134 Neurymenia fraxinifolia (Mertens ex Turner) J. Agardh 1863[1851-1863]: 1135. Fucus fraxinifolius Mertens ex Turner 1811: 140. References: Tanaka & Itono 1969: 7-16, figs 2-9. Type Locality: "East Indies". Distribution: Tropical and subtropical Indo-Pacific. Specimens: West of Zeewyk Passage. Dredged at 55 m (R.D. Royce, 12.v.1960; PERTH Royce 1847). Five miles east of North I.. Dredged at 37 m (R.D. Royce, 13.v.1960; PERTH Royce 1890). Long I., Wallabi Gp. From 20m. (J.M. Huisman, 4.vii.l993; MURU, HA 1002). Jackson I., Pelsaert BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 207

6. Gp. On coral rubble at 12m. (J.M. Huisman & G.A. Kendrick, 30.ix.l991; MURU, HA 068).

Genus: Osmundaria Lamouroux 1813: 42. Osmundaria spiralis (Lamouroux) Norris 1991a: 17. Delesseria spiralis Lamouroux 1813: 124, pl. 9: fig. 2. Reference: Norris 1991a: 17, figs 22, 23, 26-31 (including Houtman Abrolhos material). Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Kangaroo I. and Lacepede Bay, South Australia. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. From 10m. (J.M. Huisman, 30.ix.1994; MURU, HA 468).

Genus: Placophora J. Agardh 1863[1851-1863]: 1137. Placophora binderi (J. Agardh) J. Agardh 1863[1851-1863]: 1138-1139. Amansia binderi J. Agardh 1841: 26. Reference: Scagel 1953: 24, figs 1-4. Type Locality: Cape of Good Hope, South Africa. Distribution: Houtman Abrolhos and Rottnest I., Western Australia, and west

?TI coast of Eyre Peninsula, South Australia; South Africa; Peru; Timor Sea; Tristan da Cunha; Japan. Specimens: Mostyn's Lump, Pelsaert Gp. Epiphytic on Heterostroma nereidiis (G. T. Kraft & J.M. Huisman, 14.x.1990; MELU, K8641).

Genus: Polysiphonia Greville 1823: pl. 90. '!Q ,_5[ Polysiphonia decipiens Montagne 1842: 5. Reference: Womersley 1979: 499-502, fig. 12. Type Locality: Auckland Islands. See Womersley (1979: 501) regarding problems with the type locality. Distribution: Houtman Abrolhos, Western Australia, to Newcastle, New South Wales; South I. & Stewart I., New Zealand; Auckland Islands; Tierra del Fuego. Specimens: Jackson I., Pelsaert Gp. (J.M. Huisman, 30.ix.1991; MURU, HA 1094). Polysiphonia gracilis Tseng 1944: 74. Reference: Millar. 1990: 444-445, figs 63D-F. Type Locality: Tsuenwan, Kowloon, Hong Kong. Distribution: Houtman Abrolhos, Western Australia; Coffs Harbour, New South Wales; possibly Queensland; Hong Kong. Specimens: Fish Point, East Wallabi I., Wallabi Gp. On Titanophora weberae (J.M. Huisman, 26.ix.1994; MURU, HA 1074). Remarks: The present collections appear to be identical to plants described by Millar (1990) from Coffs Harbour, New South Wales. Millar only tentatively placed his material in P gracilis, as features of the tetrasporangial plants differed slightly to those described by Tseng (1944). These differences have also been noted in the Houtman Abrolhos material.

Genus: Protokuetzingia Falkenberg in Schmitz & Falkenberg 1897: 469. Protokuetzingia australasica (Montagne) Falkenberg in Schmitz & Falkenberg 1897: 469. Rhodomela australasica Montagne 1840[1839-1841]: 154. Reference: Harvey 1858: pl. XXVII (as Rytiphlaea australasica). Type Locality: Tasmania. Distribution: Southern and western Australia. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. On the stems of Amphibolis grif.fithii at 10 m. (J.M. Huisman, 30.ix.1994; MURU, HA 444, 456)

Genus: Spirocladia B¢rgesen 1933~ 14. Spirocladia barodensis B¢rgesen 1933: 1-15, figs 1-10. Reference: Millar 1990: 453-455. Type Locality: Baroda, India. Distribution: Probably from the Houtman Abrolhos, Western Australia, around northern Australia to Coffs Harbour, New South Wales; India. Specimens: 208 J.M. HUISMAN

Mostyn's Lump, Pelsaert Gp. (J.M. Huisman, 29.ix.1991; MURU, HA 1045).

Genus: Tolypiocladia Schmitz in Schmitz & Falkenberg 1897: 441. Tolypiocladia glomerulata (C. Agardh) Schmitz in Schmitz & Falkenberg 1897: 442. Hutchinsia glomerulata C. Agardh 1824: 158. Reference: Price & Scott, 1992: 219-221, fig. 81A-D. Type Locality: Shark Bay, Western Australia. Distribution: Widely distributed in tropical Indo-west Pacific. Specimens: Nth of Beacon I., Wallabi Gp. From 2-3 m. (J.M. Huisman, 8.vii.1993; MURU, HA 1024). Goss Passage, Wallabi Gp. From 30m. (J.M. Huisman, 3l.ix.1994; MURU, HA 401, 404). Coral Patches, Pelsaert Gp. From 20m. (J.M. Huisman, 5.xii.1988; MURU, HA 1023).

Order Corallinales Family Corallinaceae

Genus: Amphiroa Lamouroux 1812: 185. Amphiroa anceps (Lamarck) Decaisne 1842: 125. Corallina anceps Lamarck 1815: 238. Reference: Millar 1990: 315-317, figs 9A-H. Type Locality: "les mers Australes ou de Ia Nouv. Holl." Distribution: Indo-West Pacific Ocean. Record: Sammy (1972: 63). Amphiroafoliacea Lamouroux in Quoy & Gaimard 1824: 628, pl. 93: figs 2, 3. Reference: Weber-van Bosse 1904: 92, pl. 14, figs 1-11. Type Locality: Mariana Islands. Distribution: Widespread in warmer oceans. Specimens: 'Dog Rock', Pelsaert Gp. From 1-2 m. on reef crest. (J.M. Huisman, 12.xi.1995; MURU, HA 1332). Amphiroa gracilis Harvey 1855b: 547. Reference: Harvey 1862: pl. CCXXXI. Type Locality: Fremantle, Western Australia. Distribution: Australia and the Pacific. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. (J.M. Huisman, 30.ix.1994; MURU, HA 448).

Genus: Haliptilon (Decaisne) Lindley 1846: 25. Haliptilon roseum (Lamarck) Garbary & Johansen 1982: 218. Corallina rosea Lamarck 1815: 235-236. Reference: Johansen & Womersley 1986: 551, figs 1-6. Type Locality: "le mers Australs". Distribution: Kalbarri, Western Australia, around southern Australia to Port Denison, Queensland; New Zealand. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. On Amphibolis spp at 10m. (J.M. Huisman, 30.ix.1994; MURU, HA 443, 445, 452, 454).

Genus: Hydrolithon Foslie 1909: 55. Hydrolithonfarinosum (Lamouroux) Penrose & Chamberlain 1993: 295. Melobesiafarinosa Lamouroux 1816: 315. References: Penrose & Chamberlain 1993: 295. Barry & Woelkerling 1995. Type Locality: Mediterranean Sea. Distribution: British Isles; Mediterranean Sea; Adriatic Sea; Red Sea; Kenya; Indonesia; South Africa; Australia. Specimens: West of Long I., Wallabi Gp. Epiphytic on Lobophora (J.M. Huisman, 4.vii.1993; MURU HA 304). Fish Point, East Wallabi I., Wallabi Gp. Epiphytic on Zonaria (J.M. Huisman, 26.ix.l994; MURU, HA 770). Hydrolithon onkodes (Heydrich) Penrose & Woelkerling 1992: 83. Lithophyllum onkodes BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 209

Heydrich 1897: 6. References: Penrose & Woelkerling 1988. Barry & Woelkerling 1995. Type Locality: Tami Island, north-west edge of Huon Gulf, New Guinea. Distribution: Australia; Hawaii; Guam; Philippines; Bikini; Solomon Islands; Indonesia; West Africa. Specimens: Third Sister 1., Wallabi Gp. (J.M. Huisman, 28.ix.1994; MURU, HA 719). Nth of Beacon 1., Wallabi Gp. (J.M. Huisman, 28.ix.1994; MURU, HA 721).

Genus: ]ania Lamouroux 1812: 186. ]ania pulchella (Harvey) Johansen & Womersley 1994: 619. Cheilosporum pulchellum Harvey 1855b: 547. Reference: Johansen & Womersley 1994: 619- 623, figs 19, 20, 41, 42. Type Locality Rottnest 1., Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Portland (possibly Gabo 1.), Victoria. Specimen: Third Sister, Wallabi Gp. From < 1 m. (J.M. Huisman, 28.ix.1994; MURU, HA 628). Coronation 1., Pelsaert Gp. On Sargassumfallax (Aquinas Coli. Exp. B14, 24.viii.1970; AD, A43856).

Genus: Lithophyllum Philippi 1837: 387. Lithophyllum bermudense Foslie & Howe 1906: 132. References: Woelkerling & Campbell 1992. Barry & Woelkerling 1995. Type Locality: Spanish Point, Bermuda. Distribution: Bermuda; Florida; Caribbean Sea; Australia. Specimen: Coronation Is., Pelsaert Gp. (J.M. Huisman, 24.ix.1994; MURU, HA 713).

Genus: Mesophyllum Lemoine 1928: 251. Mesophyllum engelhartii (Foslie) Adey 1970: 23. Lithothamnion engelhartii Foslie 1900: 18. References: Woelkerling & Harvey 1993. Barry & Woelkerling 1995. Type Locality: Cape Jaffa, South Australia. Distribution: Fiji; New Zealand; Auckland Is.; subtropical eastern to western Australia; South Africa. Specimens: West of Long Is., Wallabi Gp. (J.M. Huisman, 4 vii 1993; MURU, HA 302). Coronation Is., Pelsaert Gp. (J.M. Huisman, 24.ix.1994; MURU, HA 715). Mesophyllum erubescens (Foslie) Lemoine 1928: 252. Lithothamnion erubescens Foslie 1900: 9-10. References: Verheij 1993. Keats & Chamberlain 1994. Type Locality: Chaloup Bay, Fernando de Noronha, Brazil. Distribution: Houtman Abrolhos; Brazil; Cap Verd; Caribbean Sea; Korea; Japan; Hawaii; Guam; Indonesia; South Africa; Madagascar; Kenya; Sri Lanka. Specimens: Nth of Beacon 1., Wallabi Gp. (J.M. Huisman, 28.ix.1994; MURU, HA 722). Coronation Is., Pelsaert Gp. (J.M. Huisman, 24.ix.l994; MURU, HA 716). Mesophyllum funafutiense (Foslie) Verheij 1993: 62. Lithothamnion philippii f. funafutiensis Foslie 1899: 3. Reference: Keats & Chamberlain 1994. Type Locality: Tutange, Funafuti, Tuvalu. Distribution: Tuvalu; Hawaii; Guam; Thailand; Indonesia; Red Sea; South Africa. Specimens: Coronation Is., Pelsaert Gp. (J.M. Huisman, 24.ix.l994; MURU, HA 717).

Genus: Metagoniolithon Weber-van Bosse 1904: 86, 101. Metagoniolithon radiatum (Lamarck) Ducker 1979: 85, figs 4-8. Corallina radiata Lamarck 1815: 240. Reference: Ducker 1979: 85-88, figs 4-8. Type Locality: "Habite les mers de la Nouvelle-Hollande". Distribution: Port Denison, Western Australia, to Cape Paterson, Victoria, King I. and northern Tasmania. Specimen: Near Pigeon Rock, West Wallabi 1., Wallabi Gp. Epilithic at< 2m. (J.M. Huisman, 30.ix.1994; MURU, HA 481). 210 J.M. HUISMAN

Metagoniolithon stelliferum (Lamark) Weber-van Bosse 1904: 103, pl. 15, figs 9, 13. Corallina stellifera Lamarck 1815: 239. References: Ducker 1979: 83, figs 1-3. Fuhrer et al. 1981: 19, pl.ll. Type Locality: "Habite les mers australes ou de la Nouvelle-Hollande" Distribution: Houtman Abrolhos to Refuge Cove, east of Wilsons Promontory, Victoria, King & Flinders Is., northern Tasmania; Seychelles. Specimens: Turtle Bay, East Wallabi 1., Wallabi Gp. On Amphibolis antarctica stems at 5 m. (J.M. Huisman, 5.vii.l993; MURU, HA 307).

Genus: Metamastophora Setchell 1943: 130. Metamastophora jlabellata (Sonder) Setchell 1943: 131. Melobesia flabellata Sonder 1845: 55. Reference: Woelkerling 1980. Type Locality: Western Australia. Distribution: Western and southern Australia; southern Africa. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. On rock at 10 m. (J.M. Huisman, 30.ix.1994; MURU, HA 432).West of Zeewyk Passage. Dredged at 55 m (R.D. Royce, 12.v.1960; PERTH Royce 1855, 1857).

Genus: Pneophyllum Kiitzing 1843: 385. Pneophyllumfragile Kiitzing 1843: 385. References: Penrose & Woelkerling 1991. Barry & Woelkerling 1995. Type Locality: Mediterranean Sea. Distribution: Probably cosmopolitan. Specimens: West of Long Is., Wallabi Gp. Epiphytic on Acrosorium sp. and Mesophyllum engelhartii (J.M. Huisman, 4.vii.l993; MURU, HA 303). Coral Patches, Pelsaert Gp. (J.M. Huisman, 21.i.1990; MURU, HA 724).

Order Gelidiales Family Gelidiaceae

Genus: Gelidium Lamouroux 1813: 128. Gelidium australe J. Agardh 1872: 30. Reference: Womersley & Guiry 1994: 132, figs 35C, 38E-I. Type Locality: Port Phillip, Victoria. Distribution: Houtman Abrolhos, Western Australia to Walkerville, Victoria, and around Tasmania. Specimen: Goss Passage, Wallabi Gp. (J.M. Huisman, 3.vii.1993; MURU, HA 1102).

Genus: Pterocladia J. Agardh 1851[1851-1863]: xi; 1852: 482. Pterocladia Iucida (R. Brown ex Turner) J. Agardh 1851[1851-1863]: 483. Fucus lucidus R. Brown ex Turner 1815-1819: 98-99. References: Womersley & Guiry 1994: 137-139, plate 2, fig. 4; figs 40A, B, 41A-E. Type Locality: South coast of New Holland. Distribution: Kalbarri, Western Australia to Coffs Harbour, New South Wales; New Zealand. Specimens: Jackson 1., Pelsaert Gp. (J.M. Huisman, 30.ix.1991; MURU, HA 059).

Family Gelidiellaceae

Genus: Gelidiella Feldmann & Hamel 1934: 529. Gelidiella pannosa (Feldmann) Feldmann & Hamel 1934: 534. Echinocaulon pannosum Feldmann 1931: 12. Reference: Price & Scott 1992: 27-30, fig. 5A-F. Type Locality: Biarritz, BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 211

France. Distribution: Widely distributed, particularly in warmer seas. Specimen: Sister's Passage, Wallabi Gp. (J.M. Huisman, 29.ix.1994; MURU, HA 1047).

Order Gigartinales Family Acrotylaceae

Genus: Amphiplexia J. Agardh 1892: 104. Amphiplexia hymenocladioides J. Agardh 1892: 111, pl. 3, figs 2-11. Reference: Kraft 1977a: 117, figs 7,8,15,16. Type Locality: Port Phillip Heads, Victoria. Distribution: Houtman Abrolhos, Western Australia, to Port Phillip Heads, Victoria. Specimens: Eastern Passage, Easter Gp. From 10-20 m. (J.M. Huisman & T.H. Rose, 23.x.1988; MURU, HA 052). Coral Patches, Pelsaert Gp. On coral at 13m. (J.M. Huisman, 2l.i.1990; MURU, HA 977).

Genus: Claviclonium Kraft & Min-Thein 1983: 171. Claviclonium ovatum (Lamouroux) Kraft & Min-Thein 1983: 172. Gigartina ovata Lamouroux 1813: 136, pl. 10, fig. 7. Reference: Kraft & Min-Thein 1983: 172, figs 1-15. Type Locality: 'Nouv. Holl.'. Distribution: Houtman Abrolhos and Geraldton to Eucla, Western Australia. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. Drift. (J.M. Huisman, 30.x.1994; MURU, HA 435, 446). From 10m. (J.M. Huisman, 27.ix.1986; MURU, HA 1039).

Genus: Hennedya Harvey 1855b: 552. Hennedya crispa Harvey 1855b: 552. References: Kraft 1977a: 113, figs 5,6,14. Kraft & Womersley 1994: 368-369, figs 120C, D, 121 H-M. Type Locality: Garden or Rottnest Is., Western Australia. Distribution: From the Houtman Abrolhos, Western Australia, to Pearson I., South Australia. Specimens: 20 km NW of Wallabi Gp. From 22m. (France, ii.1979; AD, A51708). Turtle Bay, East Wallabi I., Wallabi Gp. From 10 m. (J.M. Huisman, 27 .ix.1986; MURU, HA 144). The Nook, Pelsaert Gp. From 15-20 m. (J.M. Huisman, 3.xii.1988; MURU, HA 154).

Family Areschougiaceae

Genus: Areschougia Harvey 1855b: 554. Areschougia ligulata Harvey ex J. Agardh 1872: 26. Reference: Min-Thein & Womersley, 1976: 61, figs 20-22, 58A. Type Locality: Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Kangaroo Island, South Australia. Specimen: Old Guano Jetty, West Wallabi I., Wallabi Gp. From 1-3m. (J.M. Huisman, 13.iv.1991; MURU, HA 031).

Genus: Callophycus Trevisan 1848: 107. Callophycus serratus (Harvey ex Kiitzing) Silva 1957: 143. Thysanocladia serrata Harvey ex Kiitzing 1869: 10, pl. 29, figs a, b. References: Kraft 1984b: 54-58, figs 2-16, 50. Type Locality: Tonga. Distribution: Widespread in the warmer waters of the Indo-Pacific. Specimens: Sisters Passage, Wallabi Gp. From 5 m. (J.M. Huisman, 29.ix.1994; MURU, HA 212 J.M. HUISMAN

531). Nth-east Eastern Passage, Easter Gp. From 10-20 m. (J.M. Huisman & TH. Rose 22.x.l988; MURU, HA 137). Jackson 1., Pelsaert Gp. (J.M. Huisman, 18.viii.1990; MURu: HA 160). Callophycus oppositifolius (C. Agardh) Silva 1957: 143. Sphaerococcus oppositifolius c. Agardh 1822[1822-1823]: 294. References: Min-Thein & Womersley 1976: 23, figs 7, 8, 51B, 52A. Kraft 1984b: fig. 51. Type Locality: "Nov. Holl." Distribution: Houtman Abrolhos and Geraldton, Western Australia, to Kangaroo I. and Yorke Peninsula, South Australia. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. From 10m. (J.M. Huisman, 27.ix.l986; MURU, HA 180, 147).

Genus: Erythroclonium Sander 1853: 691. Erythroclonium sonderi Harvey 1859: pl. 86. Reference: Min-Thein & Womersley 1976: 84, fig 61A. Type Locality: Fremantle, Western Australia. Distribution: From the Houtman Abrolhos, Western Australia, to Robe, South Australia, and mouth of Currie River, Tasmania. Specimens: Turtle Bay, East Wallabi 1., Wallabi Gp. From 5 m. (J.M. Huisman, 5.vii.l993; MURU, HA 1038). The Nook, Pelsaert Gp. From 15-20 m. (J.M. Huisman & P Dingle, 3.xii.1988; MURU, HA 155 & 173).

Genus: Eucheuma J. Agardh 1847: 16. Eucheuma denticulatum (N.L. Burman) Collins and Hervey 1917: 106. Fucus denticulatus N. L. Burman 1768: 28. Type Locality: Supposedly Cape of Good Hope, South Africa, but probably an error (Silva et al. 1987). Distribution: Warmer waters of the Indo-Pacific. Record: May 1946: 123 (as Eucheuma muricatum (Gmelin) Weber-van Bosse). Specimen: Pelsaert I., Pelsaert Group. Drift on west side of island (D.L. Serventy, xi.1944; NSW). Eucheuma gelatinum (Esper) J. Agardh 1847:16. Fucus gelatinus Esper 1800[1797-1800]: 188, pl. CI. Type Locality: Not specified. Distribution: Warmer waters of the Indo-Pacific. Record: May 1946: 122. Specimen: Abrolhos Islands (D.L. Serventy, v.1944; NSW). Eucheuma speciosum (Sander) J. Agardh 1851[1851-1863]: 628. Gigartina speciosa Sander 1845: 55. Reference: Harvey 1859: pl. 64. Type Locality: Western Australia. Distribution: Western Australia; Madagascar; Mauritius. Specimens: Sth end of Goss Passage, Wallabi Gp. From 15m. (J.M. Huisman, 6.vii.1993; MURU, HA 933). Turtle Bay, East Wallabi 1., Wallabi Gp. From 10m. (J.M. Huisman, 27.ix.1986; MURU, HA 931). 'Anemone Lump', Eastern Passage, Easter Gp. From 3m. (J.M. Huisman, 4.xii.1988; MURU, HA 044).

Genus: Meristotheca J. Agardh 1872: 36. Meristotheca papulosa (Montagne) J. Agardh 1872: 36. Callymenia papulosa Montagne 1850: 246. Reference: Gabrielson & Kraft 1984: 239, figs 12,13. Type Locality: Hodeida, Yemen. Distribution: Red Sea; Pakistan; Timor; Japan; China; Philippines; Western Australia; Lord Howe 1., New South Wales. Specimens: East of Seal 1., Wallabi Gp. From 15-20 m. (J.M. Huisman, 29.ix.1994; MURU, HA 558). 'Anemone Lump', Eastern Passage, Easter Gp., From 3m. (J.M. Huisman & P Dingle, 4.xii.1988; MURU, HA 014). Mostyn's Lump, Pelsaert Gp. On rock in sand at 20m. (J.M. Huisman & G.A. Kendrick, 29.ix.1991; MURU, HA 049). The Nook, Pelsaert Gp. From 10-20 m. (J.M. Huisman & TH. Rose, 24.x.1988; MURU, HA 132). BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 213

Genus: Solieria J. Agardh 1842: 156. Solieria robusta (Greville) Kylin 1932: 18. Dumontia robusta Greville 1830: 62. References: Min-Thein & Womersley 1976: 7, figs 1, 2, 49. Gabrielson & Kraft 1984: 219-222, fig. 1, A, B; fig. 2, A, B. Type Locality: "Nov. Holl." -probably near Fremantle, Western Australia. Distribution: Found in most Australian waters; Mauritius; South Africa; India; Philippines; China; Japan. Specimens: Turtle Bay, East Wallabi 1., Wallabi Gp. On rock at 10 m. (J.M. Huisman, 30.ix.1994; MURU, HA 441).

Family Cystocloniaceae

Genus: Craspedocarpus Schmitz ex Schmitz & Hauptfleisch 1897: 375. Craspedocarpus venosus (Kiitzing) Min-Thein & Womersley 1976: 113. Stictophyllum venosum Kiitzing 1866: 4, pl. 9, fig. 3. Reference: Min-Thein & Womersley 1976: 112-116, figs 41, 42, 64. Type Locality: 'Nov. Holl.' Distribution: From the Houtman Abrolhos, Western Australia, to Westernport Bay, Victoria, and Flinders Island, Bass Strait. Specimen: Turtle Bay, East Wallabi 1., Wallabi Gp. On Amphibolis antarctica at 10 m. (J.M. Huisman, 30.ix.1994; MURU, HA 461).

Family Dicranemataceae

Genus: Dicranema Sander 1845: 56. Dicranema revolutum (C. Agardh) J. Agardh 1852[1851-1863]: 634. Sphaerococcus revolutus C. Agardh 1822[1822-1823]: 334. References: Kraft 1977b: 223, figs 1-3,12,13. Kraft & Womersley 1994: 322-324, figs 103F-J, 104A-C, 105A, B. Type Locality: Freycinet Harbour, Shark Bay, Western Australia. Distribution: From Shark Bay, Western Australia, to Walkerville, Victoria, and Flinders 1., Bass Strait. Specimen: Old Guano Jetty, West Wallabi 1., Wallabi Gp. On Amphibolis antarctica at 1-3m. (J.M. Huisman, 13.iv.1991; MURU, HA 039).

Genus: Tylotus J. Agardh 1876: 428. Tylotus obtusatus (Sander) J. Agardh 1876: 428. Chondrus obtusatus Sander 1845: 56. References: Kraft 1977b: 245-250, figs 10,11,19,20. Harvey 1862: pl. 210 (as Curdiea obtusata). Type Locality: Geographe Bay, Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Western Port, Victoria; South Africa. Specimens: Nth of Beacon 1., Wallabi Gp. From 2-3m. (J.M. Huisman, 8.vii.1993; MURU, HA 1027, 1028). Goss Passage, Wallabi Gp. From 20m. (J.M. Huisman, 3.vii.l993; MURU, HA 1031).

Family Dumontiaceae

Genus: Acrosymphyton Sjostedt 1926: 8. Acrosymphyton taylorii Abbott 1962: 845, figs 1-9. References: Millar & Kraft 1984: 135, 214 J.M. HUISMAN figs 2-10. Womersley 1994: 220-222, figs 68A, 69A-D. Type Locality: Hauula, Oahu Hawaiian Is. Distribution: Hawaii; Rottnest I. & Abrolhos Is., Western Australia; Coff~ Harbour & Lord Howe I., New South Wales; Great Barrier Reef, Queensland; Japan. Specimens: North of Morning Reef, Wallabi Gp. From 20m. (J.M. Huisman, 28.ix.l986· MURU, HA 083, 976). Coral Patches, Pe1saert Gp. From 20 m. (J.M. Huisman, 5.vii.l988:, MURU, HA 975).

Genus: Dudresnaya Crouan & Crouan 1835: 98, pl. 2 figs 2, 3. Dudresnaya capricornica Robins & Kraft 1985: 23. Reference: Robins & Kraft 1985: 23, figs 90-129. Type Locality: One Tree I., Great Barrier Reef, Queensland. Distribution: Houtman Abrolhos and Rottnest I., Western Australia; Lord Howe I., New South Wales; Great Barrier Reef, Queensland. Specimens: North-west Eastern Channel, Easter Gp. On coral (J.M. Huisman, 28.ix.l991; MURU, HA 1043).

Genus: Rhodopeltis Harvey 1863: pl. CCLXIV. Rhodopeltis borealis Yamada 1931: 75-76, pl 19, fig. 1. Reference: Nozawa 1970: 102-107, figs lA-C, 2,3. Syntype Localities: Ryukyu-retto, Japan; Ryusensui, Kotosho, Taiwan. Distribution: Houtman Abrolhos and Rottnest I., Western Australia; Taiwan; southern Japan; Philippines. Specimens: Third Sister, Wallabi Gp. From 15-18 m. (J.M. Huisman, 28.ix.1994; MURU, HA 609, 610). Turtle Bay, East Wallabi I., Wallabi Group. On rock at 5 m. (J.M. Huisman, 5.vii.1993; MURU, HA 1015).

Family Hypneaceae

Genus: Hypnea Lamouroux 1813: 131. Hypnea spinella (C. Agardh) Kiitzing 1847: 23. Sphaerococcus spinellus C. Agardh 1822[1822-1823]: 323-324. References: Price & Scott 1992: 40-44, figs 9B, lOA-F. Cribb 1983: 60-61, pl. 15, fig. 4. Type Locality: West Indies. Distribution: Widely distributed. Record: May (1951: 87)- specimen not seen during present study. Hypnea valentiae (Turner) Montagne 1841[1839-1841]: 161. Fucus valentiae Turner 1809: 17, pl. 78. Reference: Womersley 1994: 445, figs 154F, 156A-C. Type Locality: Red Sea. Distribution: Widespread in tropical and subtropical seas. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. From 5 m. (J.M. Huisman, 5.vii.1993; MURU, HA 1104).

Family Kallymeniaceae

Genus: Glaphrymenia J. Agardh 1885: 52. Glaphrymenia pustulosa J. Agardh 1885: 52. Reference: Womersley 1994: 240, figs 74C, D, 75L-O. Type Locality: Port Phillip, Victoria. Distribution: Houtman Abrolhos, Western Australia, to Port Phillip, Victoria, and south-east Tasmania; New Zealand. Specimens: Coral Patches, Pelsaert Gp. From 13m. (J.M. Huisman, 21.i.l990; MURU, HA 166, 949). BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 215

Genus: Kallymenia J. Agardh 1842: 9. Kallymenia cribrogloea Womersley & Norris 1971: 7. References: Womersley 1994: 233-235, figs 72B, C, 73F-J. Womersley & Norris 1971: 7-9, figs 6--12, 78-80. Type Locality: Great Taylor Bay, Bruny 1., Tasmania. Distribution: Houtman Abrolhos, Western Australia; Waldegrave 1., South Australia, to Jervis Bay, New South Wales, and south-east Tasmania. Specimen: Eastern Passage, Easter Gp. From 10-20 m. (J.M. Huisman & T.H. Rose, 23.x.1988; MURU, HA 1103). Kallymenia cribrosa Harvey 1855b: 555. References: Womersley 1994: 233, figs 72A, 73A­ E. Womersley & Norris 1971: 4-7, figs 1-5, 77 (including Houtman Abrolhos record). Type Locality: Fremantle, Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Tasmania. Specimen: The Nook, Pelsaert Gp. From 10-20 m. (J.M. Huisman, 24.x.l988; MURU, HA 073).

Family Nemastomataceae

Genus: Nemastoma J. Agardh 1842: 89. Nemastoma damaecornis Harvey 1855b: 557. Type Locality: Fremantle or Rottnest 1., Western Australia. Distribution: Rottnest I. north to the Houtman Abrolhos, Western Australia. Specimens: Nth- east Eastern Passage, Easter Gp. From 8-12 m. (J.M. Huisman, 26.ix.l994; MURU, HA 827). Coral Patches, Pelsaert Gp. From 13 m. (J.M. Huisman, 2l.i.1990; MURU, HA 999, 1000).

Genus: Predaea De Toni f. 1936: 5. Predaea laciniosa Kraft 1984a: 11. Reference: Kraft 1984a: 11-15, figs 25-35. Type Locality: Coral Gardens, Heron Island, Queensland. Distribution: Houtman Abrolhos, Western Australia, and the southern Great Barrier Reef, Queensland. Specimens: Coral Patches, Pelsaert Gp. From 16m. (J.M. Huisman, 24.ix.l994; MURU, HA 852). Predaea weldii Kraft & Abbott 1971: 194. Reference: Kraft 1984a: 15-19, figs 36-42. Type Locality: Kaneohe Bay, Oahu 1., Hawaii. Distribution: Houtman Abrolhos, Western Australia, and north-eastern Australia; Hawaii; Venezuela. Specimens: Fish Point, East Wallabi 1., Wallabi Gp. On rock at 10--12 m. (J.M. Huisman, 26.ix.l994; MURU, HA 754, 755). Eastern Passage, Easter Group. On coral at 10--20 m. (J.M. Huisman & T.H. Rose, 23.x.l988; MURU, HA 055 139). The Nook, Pelsaert Gp. Growing on Acropora at 10-20 m. (J.M. Huisman & T.H. Rose, 24.x.1988; MURU, HA AB 002).

Genus: Titanophora (J. Agardh) J. Feldmann 1942: Ill. Titanophora weberae B¢rgesen 1943: 39. References: B¢rgesen 1943: 39, fig. 13. Mshigeni & Papenfuss 1980: 780-785, figs I, 3-20. Type Locality: Salee Strait, Irian Barat, Indonesia. Distribution: Tropical Indo-Pacific. Specimens: Fish Point, East Wallabi 1., Wallabi Gp. From 10--12 m. (l.M. Huisman, 26.ix.l994; MURU, HA 764). Goss Passage, Wallabi Gp. From 30 m. (J.M. Huisman, 3l.ix.l994; MURU, HA 392). Nth-east Eastern Passage, Easter Gp. Between coral at 8-12 m. (J.M. Huisman, 26.ix.l994; MURU, HA 787). 216 J.M. HUISMAN

Family Nizymeniaceae

Genus: Nizymenia Sonder 1855: 520. Nizymenia conferta (Harvey) Chiovitti, Saunders & Kraft in Chiovitti et al. 1995: 164. Areschougia conferta Harvey 1860: pl. CLXVI. References: Chiovitti et al. 1995: figs 4-6. Womersley 1994: 405-407, fig. 138 [as Stenocladia australis (Sonder) Silva]. Searles 1968: 35-39, fig. 16, pl. 7 [as Stenocladia australis (Sonder) Silva]. Type Locality: Swan River, Western Australia. Distribution: From the Houtman Abrolhos and Geraldton, Western Australia, to Port Phillip Heads, Victoria, and north-west Tasmania. Specimen: Turtle Bay, East Wallabi I., Wallabi Gp. From 10m. (J.M. Huisman, 30.ix.1994; MURU, HA 430). Remarks: Until recently this species was known as Stenocladia australis. Chiovitti et al. (1995) transferred it to Nizymenia, based on polysaccharide, anatomical and nucleotide sequence data.

Family Peyssonneliaceae

Genus: Peyssonnelia Decaisne 1841: 168. Peyssonnelia capensis Montagne 1847: 177. Reference: Denizot 1968: 123, figs 105, 107. Womersley 1994: 155-157, figs 44B, 45D-F. Type Locality: Port Natal, South Africa. Distribution: Western, southern and eastern Australia; South Africa; Angola; Japan; Solomon Is. Specimens: Coral Patches, Easter Gp. From 16m. (J.M. Huisman, 24.ix.1994; MURU, HA 837). Peyssonnelia inamoena Pilger 1911: 311. Reference: Womersley 1994: 164-165. Type Locality: Gross-Batanga, Cameroon, West Africa. Distribution: Widely distributed in tropical and warm-temperate sea. Specimen: Turtle Bay, East Wallabi I., Wallabi Gp. From 5 m. (l.M. Huisman, 5.vii.1993; MURU, HA 1042).

Family Phacelocarpaceae

Genus: Phacelocarpus Endlicher & Diesing 1845: 290. Phacelocarpus alatus Harvey 1855b: 549. Reference: Womersley 1994: 393-395, fig. 132. Type Locality: Rottnest Island, Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Walkerville, Victoria. Specimen: Turtle Bay, East Wallabi I., Wallabi Gp. Drift (J.M. Huisman, 30.ix.1994; MURU, HA 469).

Family Rhizophyllidaceae

Genus: Portieria Zanardini 1851: 33. Portieria hornemannii (Lyngbye) P.C. Silva in Silva et al. 1987: 129. Desmia hornemanniii Lyngbye 1819: 35, pl. 7c. Reference: Cribb 1983: 35-36, pl. 8, fig. 2 (as Chondrococcus hornemannii (Lyngbye) Schmitz). Type Locality: Probably Red Sea. Distribution: Tropical BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 217

Indo-Pacific. Specimen: Coral Patches, Pelsaert Gp. (J.M. Huisman, 3.x.1995; MDRD, HA 1242).

Order Gracilariales Family Gracilariaceae

Genus: Curdiea Harvey 1855a: 333. Curdiea obesa (Harvey) Kylin 1932: 61. Sarcocladia obesa Harvey 1855b: 550. Reference: Harvey 1862: pl. CCXVII (as Sarcocladia obesa). Type Locality: King George's Sound or Rottnest I., Western Australia. Distribution: Western and south-western coasts of Australia. Specimens: Long 1., Wallabi Gp. From 20m. (J.M. Huisman, 5.vii.1993; MDRD, HA 987). Coral Patches, Pelsaert Gp. From 10-15 m. (J.M. Huisman, 14.iv.1991; MDRD, HA 036).

Genus: Gracilaria Greville 1830: 121. Gracilaria canaliculata Sonder 1871: 56. Reference: Withell et al. 1994: 301-302, figs 16, 17. Type Locality: Wagap, New Caledonia. Distribution: Widely distributed in warmer waters of the Indo-West Pacific. Found as far south as Rottnest Island on the west coast of Australia. Specimens examined: Fish Point, East Wallabi 1., Wallabi Gp. From 10-12 m. (J.M. Huisman, 26.ix.1994; MDRD, HA 756). Goss Passage, Wallabi Gp. From 20 m. (J.M. Huisman, 3.vii.1993; MELD A40753, 40754). Remarks: Gracilaria canalicula has been regarded as a form of Gracilaria salicornia (C. Agardh) Dawson (see Withell et al. 1994), but the unconstricted habit of the present specimens seems distinct from that of typical G. salicomia, in which the thallus is divided into clavate segments (as seen in specimens from north-western Australia). Gracilaria preissiana (Sonder) Womersley in Min-Thein & Womersley 1976: 109. Rhodomenia preissiana Sonder 1845: 56. References: Withell et al. 1994: 294-297, figs 11- 13. Type Locality: South-western Australia. Distribution: Houtman Abrolhos to King George Sound, Western Australia, and Cape York, Queensland. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. From 10m. (J.M. Huisman, 30.ix.1994; MDRD, HA 438). Mostyn's Lump(= Huisman's Pinnacle in Withell et al. 1994), Pelsaert Gp. From 20-24 m. (J.M. Huisman & G.T Kraft, 14.x.1990; MELD 40691). Gracilaria textorii (Suringar) De Toni 1895: 27. Sphaerococcus textorii Suringar 1867: 259. Reference: Withell et al. 1994: 312. Type Locality: Japan. Distribution: Warmer seas of the Indo-Pacific. Specimens: Jackson I., Pelsaert Gp. On coral at 10-20 m. (G.T Kraft & J.M. Huisman, 22.i.1990; MELD K8658). Remarks: As mentioned by Withell et al. (1994), the current specimens can only be provisionally allied with this taxon until spermatangial material becomes available.

Order Halymeniales Family Halymeniaceae

Genus: Codiophyllum Gray 1872: 140. Codiophyllum flabelliforme (Sonder) Schmitz 1895: 146. Thamnoclonium flabelliforme 218 J.M. HUISMAN

Sonder 1845: 56. References: Scott et al. 1984: 291, figs 10-17. Womersley 1994: 216-218, plate 3 fig. 4; figs 65G, H, 67. Type Locality: Western Australia. Distribution: Houtman Abrolhos to King George Sound, Western Australia. Specimens: Goss Passage, Wallabi Gp. Epilithic to 20 m. (J.M. Huisman, 3.vii.1993; MURU, HA 993). Fish Point, East Wallabi I., Wallabi Gp. From 10-12 m. (J.M. Huisman, 26.ix.1994; MURU, HA 763).

Genus: Cryptonemia J. Agardh 1842: 100. Cryptonemia kallymenioides (Harvey) Kraft in Scott et al. 1982: 246. Halymenia kallymenioides Harvey 1855b: 556. References: Scott et al. 1982: 246, figs 2-25. Womersley & Lewis 1994: 184-185, figs 53C, 54D, E. Type Locality: Fremantle, Western Australia. Distribution: Houtman Abrolhos to Hamelin Bay, Western Australia. Specimens: Nth of Morning Reef, Wallabi Gp. From 20m. (J.M. Huisman, 28.ix.1986; MURU, HA 988). Turtle Bay, East Wallabi I. On vertical rock walls at 10 m. (J.M. Huisman, 27.ix.1986; MURU, HA 145).

Genus: Epiphloea J. Agardh 1890: 18, 1894: 48. Epiphloea bullosa (Harvey) De Toni 1905: 1578. Schizymenia ? bullosa Harvey 1863: pl. CCLXXVII. Reference: Harvey 1863: pl. CCLXXVII (as Schizymenia ? bullosa). Type Locality: Fremantle, Western Australia. Distribution: Western and southern Australia, Lord Howe I. Specimens: Third Sister, Wallabi Gp. From 18 m. (J.M. Huisman, 28.ix.1994; MURU, HA 606).East of Seal I., Wallabi Gp. From 15-20 m. (J.M. Huisman, 29.ix.l994; MURU, HA 557). Eastern Passage, Easter Gp. From 6-10 m. (J.M. Huisman, 22.x.l988; MURU, HA 086).

Genus: Gelinaria Sonder 1845: 55. Gelinaria ulvoidea Sonder 1845: 55. References: Lucas & Perrin 1947: 163, fig. 36. Harvey 1859: pl. CXXXV. Type Locality: Western Australia. Distribution: Western and south-western coasts of Australia. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. (J.M. Huisman, 27.ix.1986; MURU, HA 099). North-east Eastern Channel, Easter Gp. From 8-12 m. (J.M. Huisman, 26.ix.1994; MURU, HA 797). The Nook, Pelsaert Gp. From 10-20 m. (J.M. Huisman & T.H. Rose, 24.x.1988; MURU, HA 947).

Genus: Halymenia C. Agardh 1817: xix. Halymeniajloresia (Clemente) C. Agardh 1817: xix. Fucus floresias Clemente 1807: 312. Reference: Womersley & Lewis 1994: 189-191, fig. 56A. Type Locality: Mediterranean. Distribution: Widespread in tropical and subtropical oceans. Specimens: Mostyn's Lump, Pelsaert Gp. From 27m. (G.T. Kraft & G. Saunders, 11.xi.1995; MURU, HA 1306).

Family Sebdeniaceae

Genus: Sebdenia (J. Agardh) Berthold 1884: 21. Sebdeniajlabellata (J. Agardh) Parkinson 1980: 12. Isymeniaflabellata J. Agardh 1899: 62, 66. Reference: Schneider & Wynne 1991: 471-474, fig. 1. Lectotype Locality: Guadeloupe. BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 219

Distribution: Apparently pan-tropical. Specimens: Goss Passage, Wallabi Gp. From 30 m. (J.M. Huisman, 3l.ix.1994; MURU, HA 414).

Order Nemaliales Family Liagoraceae

Genus: Dotyophycus Abbott 1976: 125. Dotyophycus abbottiae Kraft 1988b: 132. Reference: Kraft 1988b: 131-141, figs 1-17. Type Locality: Point Clune, Rottnest I., Western Australia. Distribution: Mostyn's Lump, Pelsaert Gp. Houtman Abrolhos, and Point Clune and Thomson Bay, Rottnest I., Western Australia. Specimens: Mostyn's Lump, Pelsaert Gp. From 27m. (J.M. Huisman, 11.xi.1995; MURU, HA 1315).

Genus: Ganonema Fan & Wang 1974: 492. Ganonema farinosa (Lamouroux) Fan & Wang 1974: 492. Liagora farinosa Lamouroux 1816: 240. Reference: Womersley 1994: 94-96, pl. 2, fig. 2; figs 24B, 25E-H (as Liagora farinosa). Type Locality: Suez, Egypt. Distribution: Widespread in warmer waters. Specimen: Nth-east Eastern Passage, Easter Gp. (J.M. Huisman, 26.ix.1994; MURU, HA 794). 'Ben Ledi' wreck site, Pelsaert I., Pelsaert Group. (J.M. Huisman, 21.i.1990; MURU, HA 1068)

Genus: Gloiotrichus Huisman & Kraft 1994: 74. Gloiotrichus fractalis Huisman & Kraft 1994: 74. Reference: Huisman & Kraft 1994: 74-76, figs 1-10, 12-17. Type Locality: Northern end of Suomi Island, Easter Group, Houtman Abrolhos, Western Australia. Distribution: Known only from the Pelsaert and Easter Groups of the Houtman Abrolhos. Specimens: Nth-east Eastern Passage, Easter Gp. From 8-12 m. (J.M. Huisman, 26.ix.1994; MURU, HA, 826). Eastern Passage, Easter Gp. From 10-20 m. (J.M. Huisman & T.H. Rose, 23.x.1988; MURU, HA 136). Northern end of Suomi I., Easter Gp. From 12-15 m. (G.T. Kraft & J.M. Huisman, 12.x.1990; MELD, A30501). Coral Patches, Pelsaert Gp. From 20m. (J.M. Huisman, 5.xii.1988; MURU, HA 308).

Genus: Liagora Lamouroux 1812: 185. Liagora setchellii Yamada 1938: 13. Reference: Yamada 1938: 13-15, figs 7-8, pl. 3, fig. 2. Type Locality: Various: Naha, Miyako-zima, Isigaki-zima (Ryuku); Kasyoto (Formosa); Titi­ zima (Ogasawara Islands), Japan. Distribution: Japan, Houtman Abrolhos. Specimens: Nth of Beacon I., Wallabi Gp. From< 5 m. (J.M. Huisman, 28.ix.1994; MURU, HA 600). Remarks: Liagora crassa Levring (1953: 502) [Type Locality: Abrolhos Islands] is referable to this species.

Genus: Trichogloea Kiitzing 1847: 53. Trichogloea requienii (Montagne) Kiitzing 1847: 54. Batrachospermum requienii Montagne 1843: 355-356. Reference: Cribb 1983: 23-24, pl. 47, figs 3-4; pl. 48, fig. 2. Type Locality: Red Sea. Distribution: Widely distributed in tropical waters. Specimens: Fish Point, East Wallabi I., Wallabi. Gp. From 10-12 m. (J.M. Huisman, 26.ix.1994; MURU, HA 752, 761, 220 J.M. HUISMAN

762). Nth-east Eastern Passage, Easter Gp. From 15-20 m. (J.M. Huisman & T.H. Rose, 22.x.1988; MURU, HA 050).

Genus: Yamadaella Abbott 1970: 116. Yamadaella caenomyce (Decaisne) Abbott 1970: 117. Liagora caenomyce Decaisne 1842: 119. Reference: Abbott 1970. Type Locality: Manila, Luzon, Philippines. Distribution: Apparently widely distributed in warmer seas. Specimens: Suomi I., Easter Gp. Intertidal (J.M. Huisman, 14.iv.l991; MURU, HA 027).

Family Galaxauraceae

Genus: Galaxaura Lamouroux 1812: 185. Galaxaura marginata (Ellis & Solander) Lamouroux 1816: 264. Corallina marginata Ellis & Solander 1786: 115, pl. 22, fig. 6. Reference: Huisman & Borowitzka 1990: 157-161, figs 14- 27. Type Locality: Bahama Islands, West Indies (lectotypified on the illustration of Ellis & Solander). Distribution: Australia - throughout, although less common in colder waters. World - widely distributed in warmer seas. Specimens: Coronation I., Pelsaert Gp. (J.M. Huisman, 24.ix.1994; MURU, HA 893). Galaxaura obtusata (Ellis & Solander) Lamouroux 1816: 262. Corallina obtusata Ellis & Solander 1786: 113, pl. 22, fig. 2. Reference: Huisman & Borowitzka 1990: 161-163, figs 28- 38. Type Locality: Bahama Islands, West Indies (lectotypified on the illustration of Ellis & Solander). Distribution: Widely distributed in warmer seas. Specimens: Sth end of Goss Passage, Wallabi Gp. From 10m. (J.M. Huisman, 7.vii.1993; MURU, HA 935). Coronation I., Pelsaert Gp. (J.M. Huisman, 24.ix.1994; MURU, HA 874). Galaxaura rugosa (Ellis & Solander) Lamouroux 1816: 263. Corallina rugosa Ellis & Solander 1786: 115, pl. 22, fig. 3. Reference: Huisman & Borowitzka 1990: 153-157, figs 1- 13. Type Locality: Jamaica (lectotypified on the illustration of Ellis & Solander). Distribution: Widely distributed in warmer seas. Specimens: Goss Passage, Wallabi Gp. From 20 m. (J.M. Huisman, 3.vii.1993; MURU, HA 944). Nth of Beacon I., Wallabi Gp. From 2-3 m. (J.M. Huisman, 8.vii.1993; MURU, HA 941).

Genus: Scinaia Bivona-Bernardi 1822: 232. Scinaia tsinglanensis Tseng 1941: 106. Reference: Huisman 1986: 282-284, figs 36-47. Type Locality: Tsinglan-Kang, Wenchang, Hainan, China. Distribution: Widely distributed throughout Australia; Hainan, China. Specimens: North of Morning Reef, Wallabi Group. From 20m. (J.M. Huisman, 28.ix.1986; MURU, HA 1020, 1021, 1022). Nth-east Eastern Passage, Easter Gp. From 8-12 m. (J.M. Huisman, 26.ix.l994; MURU, HA 805). The Nook, Pelsaert Gp. From 10-20 m. (J.M. Huisman & T.H. Rose, 24.x.l988; MURU, HA 123).

Genus: Tricleocarpa Huisman & Borowitzka 1990: 164. Tricleocarpa cylindrica (Ellis & Solander) Huisman & Borowitzka 1990: 164. Corallina cylindrica Ellis & Solander 1786: 114. Reference: Huisman & Borowitzka 1990: 164-168, figs 40-45, 50-52. Type Locality: West Indies (lectotypified on the illustration of Ellis & I . BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 221

Solander). Distribution: Warmer waters generally. Specimens: 'Ben Ledi' wreck site, Pelsaert I., Pelsaert Gp. From 3m. (J.M. Huisman, 21.i.l990; MURU, HA 070).

Order Plocamiales Family Plocamiaceae

Genus: Plocamium Lamouroux 1813: 137. Plocamium preissianum Sander 1845: 54. Reference: Womersley 1971: 20, figs 29-35. Type Locality: "Austro-occidentale Novae Hollandiae". Distribution: Houtman Abrolhos, Western Australia, to Wilsons Promontory, Victoria. Record: Womersley 1971: 20. Specimens: Sth end of Goss Passage, Wallabi Gp. From 15 m. (J.M. Huisman, 6.vii.1993; MURU, HA 1006, 1007). 'Batavia' wreck site, Wallabi Gp. From 7 m. (J.M. Huisman, 7.vii.1993; MURU, HA 1003, 1004). Pelsaert I., Pelsaert Gp., drift (H.B.S. Womersley, 1.ix.1947; AD, A5871).

Order Rhodymeniales Family Champiaceae

Genus: Champia Desvaux 1809: 245. Champia compressa Harvey 1838: 402. Reference: Millar 1990: 371-373, figs 30A-D. Type Locality: Muizenberg, False Bay, Cape Province, South Africa. Distribution: Western and eastern Australia; South Africa; Sri Lanka. Specimens: East of Seal I., Wallabi Gp. From 15- 20 m. (J.M. Huisman, 29.ix.1994; MURU, HA 571). The Nook, Pelsaert Gp. From 10-20 m. (J.M. Huisman & T.H. Rose, 24.x.1988; MURU, HA 121). Champia parvula (C. Agardh) Harvey 1853: 76. Chondria parvula C. Agardh 1824: 207. Reference: Price & Scott 1992: 55-57, fig. 14A-E. Type Locality: Cadiz, Spain. Distribution: Widespread in tropical and temperate seas. Specimens: Goss Passage, Wallabi Gp. From 30 m. (J.M. Huisman, 3l.ix.1994; MURU, HA 413). Champia zostericola (Harvey) Reedman & Womersley 1976: 87. Lomentaria zostericola Harvey 1855b: 545. Reference: Reedman & Womersley 1976: 87-89, figs 5, 6, 12C, 13 (including Houtman Abrolhos record). Type Locality: Rottnest 1., Western Australia. Distribution: Houtman Abrolhos, Western Australia, to Kiama, New South Wales, and Tasmania. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. On Amphibolis stems at 10 m. (J.M. Huisman, 30.ix.1994; MURU, HA 465).

Family Lomentariaceae

Genus: Lomentaria Lyngbye 1819: 101. Lomentaria corallicola B¢rgesen 1939: 113. Reference: Price & Scott 1992: 63-66, fig. 18A­ E. Type Locality: Kharg Is., Gulf of Iran. Distribution: Northern Australia, Iran, Natal, Seychelles. Specimens: Goss Passage, Wallabi Gp. (J.M. Huisman, 31.ix.l994; MURU, HA 1098). 222 J.M. HUISMAN

Lomentaria monochlamydea (J. Agardh) Kylin 1931: 27. Chylocladia monochlamydea J. Agardh 1890: 22. References: Kylin 1931: 27, t. 13, fig. 30. Millar 1990: 374-375, figs 31A­ D. Type Locality: Port Phillip Heads, Victoria. Distribution: Houtman Abrolhos, Western Australia. Victoria; New South Wales. Specimen: Gee Bank. From 20--22 m. (J.M. Huisman & G. Kendrick, l.x.l991; MURU, HA 004).

Genus: Semnocarpa Huisman, Foard & Kraft 1993: 145. Semnocarpa minuta Huisman, Foard & Kraft 1993: 148. Reference: Huisman, Foard & Kraft 1993: 148-:153, figs 18-30. Type Locality: Green I., adjacent to Rottnest I., Western Australia. Distribution: Houtman Abrolhos to Point Peron, Western Australia. Specimen: Turtle Bay, East Wallabi I., Wallabi Gp. On stems of Amphibolis antarctica at 10 m. (l.M. Huisman, 30.ix.1994; MURU, HA 464).

Family Rhodymeniaceae

Genus: Asteromenia Huisman & Millar 1996: 138. Asteromenia peltata (Taylor) Huisman & Millar 1996: 139. Fauchea peltata Taylor 1942: 113. References: Huisman & Millar 1996. Schneider & Searles 1991: 345, figs 406, 407; Schneider 1975: 133-134, figs 2, 5, 6 (as Weberella peltata); Taylor 1960: 477, pl. 54, figs 5- 7 (as Fauchea peltata). Type Locality: Isla Tortuga, Venezuela. Distribution: Houtman Abrolhos; Norfolk Island; Iran; Maldives; Venezuela; Jamaica; Cuba; Bermuda; Brazil; North Carolina. Specimens: Turtle Bay, East Wallabi I., Wallabi Gp. From 5 m. (J.M. Huisman, 5.vii.1993; MURU, HA 703). Eastern Passage, Easter Gp. From 10-15 m. (J.M. Huisman, 25.ix.1994; MURU, HA 899). Suomi 1., Easter Gp. From 12 m. (J.M. Huisman & G. Kendrick, 28.ix.l991; MURU, HA 005). 'Ben Ledi' wreck site, Pe1saert Gp. From 3m. (J.M. Huisman, 2.i.1990; MURU, HA 705).

Genus: Botryocladia (J. Agardh) Kylin 1931: 17. Botryocladia skottsbergii (Bprgesen) Levring 1941: 645, footnote. Chrysymenia skottsbergii Bprgesen 1924: 307, figs. 49, 50. Reference: Jaasund, 1976: 103, fig. 210. Type Locality: Easter Island. Distribution: Probably widely distributed in warmer waters. Specimens: Turtle Bay, East Wallabi I. From 5 m. (J.M. Huisman, 5.vii.1993; MURU, HA 982). 'Ben Ledi' wreck site, Pelsaert I., Pelsaert Gp. From 3m. (J.M. Huisman, 21.i.l990; MURU, HA 983).

Genus: Ceratodictyon Zanardini 1878: 36 Ceratodictyon spongiosum Zanardini 1878: 37. Reference: Price & Kraft 1991: 106-116, figs 1-16. Type Locality: Wokam, Aru Islands, Indonesia. Distribution: Tropical Indo-Pacific. Specimen: Third Sister, Wallabi Gp. From 15-18 m. (l.M. Huisman, 28.ix.1994; MURU, HA 621, 622). Morley I., Easter Gp. From 10m. (J.M. Huisman, 13.iv.1991; MURU, HA 002).

Genus: Chrysymenia J. Agardh 1842: 105. Chrysymenia kaernbachii Grunow in Schumann & Hollrung 1889: 4. References: Cribb 1983: 67, pl. 19, fig. 1. Weber-van Bosse 1928: 469, figs 202-203, pl. 5, fig. 1. Type Locality: BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 223

Kelana, Papua New Guinea. Distribution: Tropical Indo-Pacific. Specimens: North-east J. Eastern Channel, Easter Gp. On coral rubble at 3 m. (J.M. Huisman, ix.l994; MURU, HA). Sisters Channel, Wallabi Gp. On coral at 5 m. (J.M. Huisman, 29.ix.l994; MURU, HA 517, 542). Chrysymenia ornata Kylin 1931: 10. Reference: Kylin 1931: 10-11, t. 3, fig. 6. Type Locality: Port Jackson, New South Wales. Distribution: Houtman Abrolhos, Western Australia; Jervis Bay to Coffs Harbour, New South Wales; Lord Howe I. Specimen: Jackson I., Pelsaert Gp. On coral. (J.M. Huisman, 30.ix.l991; MURU, HA 1044).

Genus: Coelarthrum B¢rgesen 1910: 192. Coelarthrum cliftonii (Harvey) Kylin 1931: 15. Chylocladia cliftonii Harvey 1855b: 556. References: Norris 1986: 537, figs 6-8. Harvey 1858: pl. 57 (as Chylocladia cliftoni). Huisman 1996. Type Locality: Fremantle, Western Australia. Distribution: The Montebello Is. to Fremantle, Western Australia; South Africa; Mauritius; West Indies; Canary Islands. Specimens: Nth of Morning Reef, Wallabi Gp. From 20 m. (J.M. Huisman, 28.ix.l986; MURU, HA 992). Easter Gp. On coral at 10-20 m. (J.M. Huisman & TH. Rose, 22.x.l988; MURU, HA AB 003). Snowy's I., Pelsaert Gp. (J.M. Huisman, 29.ix.l991; MURU, HA 910).

Genus: Coelothrix B¢rgesen 1920: 389. Coelothrix irregularis (Harvey) B¢rgesen 1920: 389. Cordylecladia ? irregularis Harvey 1853: 156. Reference: Price & Scott, 1992: 60, fig. 17A-D. Type Locality: Key West, Florida, U.S.A. Distribution: Tropical Indo-West Pacific region and tropical West Atlantic Ocean. Specimen: Small Islet, Wallabi Gp. (J.M. Huisman, 27.ix.l994; MURU, HA 1084). Suomi I., Easter Gp. From< 1 m. (J.M. Huisman, 14.iv.l991; MURU, HA 028).

Genus: Gelidiopsis Schmitz 1895: 148. Gelidiopsis variabilis (J. Agardh) Schmitz 1895: 148. Gelidium variabile J. Agardh 1851[1851-1863]: 468. Type Locality: Madras, India. Distribution: Widespread in warmer seas. Specimen: Jackson I., Pelsaert Gp. From 5-15m (G.T Kraft & J.M. Huisman, 14.x.l990; MELU, K8660).

Genus: Gloiocladia J. Agardh 1842: 87. Gloiocladia halymenioides (Harvey) Norris 199lb: 592. Horea halymenioides Harvey 1855b: 555. Reference: Harvey 1859: pl. LXVII; Lucas & Perrin 1947: 194, fig. 61. Type Locality: Fremantle, Western Australia. Distribution: Western and southern coast of Australia. Specimens: North of Beacon Is., Wallabi Gp. (J.M. Huisman, 6 vii 1993; MURU, HA 324). Eastern Passage, Easter Gp. (J.M. Huisman, 22.x.l988; MURU, HA 111). Coronation I., Pelsaert Gp. (J.M. Huisman, 24.ix.l994; MURU, HA 887, 890). Gloiocladia indica Weber-van Bosse 1928: 457. Reference: Kajimura 1986 (as Gloioderma japonica non-Okamura). Type Locality: Pulu Sebangkatan, Borneo Bank. Distribution: Japan, Indonesia, east and west coasts of Australia. Specimens: North of Morning Reef, Wallabi Gp. (J.M. Huisman, 28.ix.l986; MURU, HA 295). Jackson I., Pelsaert Gp. (J.M. Huisman, 30.ix.l991; MURU, HA 065). 224 J.M. HUISMAN

Gloiocladia rubrispora (Searles) Norris 199lb: 592. Gloioderma rubrisporum Searles 1984: 217. Reference: Searles 1984: 217, figs 1-5. Type Locality: 59 km off coast of North Carolina, U.S.A. Distribution: Houtman Abrolhos and Montbello Islands, Western Australia; Coffs Harbour, New South Wales; North Carolina, U.S.A. Specimens: Nth-west of Leos 1., Easter Gp. (J.M. Huisman, 28.ix.l991; MURU, HA 300).

Genus: Gloiosaccion Harvey 1859: pl. 83 Gloiosaccion brownii Harvey 1859: pl. 83. References: Fuhrer et al. 1981: 47, pl. 67 (as Botryocladia brownii). Lucas & Perrin 1947: 202, fig. 66. Type Locality: Australia. Distribution: Southern Australia; New Zealand. Specimens: Turtle Bay, East Wallabi I., Wal!abi Gp. From 5 m. (J.M. Huisman, 5.vii.l993; MURU, HA 1048).

Genus: Hymenocladia J. Agardh 1852[1851-1863]: 772. Hymenocladia usnea (R. Brown ex Turner) J. Agardh 1852[1851-1863]: 772. Fucus usnea R. Brown ex Turner 1815-1819: 70-71, pl. 225. Reference: Kylin 1956: fig. 266 C. Type Locality: Kent Islands, Bass Strait, Australia. Distribution: South-west and southern Australia. Specimens: Old Guano Jetty, West Wallabi 1., Wallabi Gp. From 1-3 m. (J.M. Huisman, 13.iv.1991; MURU, HA 034 & 038).

Genus: Rhodymenia Greville 1830: xiviii. Rhodymenia leptophylla J. Agardh 1877: 20. References: Millar 1990: 368-369, fig 27C. Adams 1994: 231, pl. 83. Type Locality: Bay oflslands, New Zealand. Distribution: Australia; New Zealand. Specimens: Turtle Bay, East Wallabi 1., Wallabi Gp. From 5 m. (J.M. Huisman, 5.vii.1993; MURU, HA 1011). Sth end of Goss Passage, Wallabi Gp. From 15 m. (J.M. Huisman, 6.vii.1993; MURU, HA 1008).

Rhodymenia sonderi P. Silva in Silva, Basson & Moe. Rhodymenia australis Souder 1845: 56. References: Fuhrer et al. 1981: 27, pl. 27. Lucas & Perrin 1947: 201, fig. 65. Harvey 1860: pl. 146 (all as Rhodymenia australis). Type Locality: Western Australia. Distribution: Southern, south eastern and south-western Australia; East Indies; New Zealand. Specimen: Mostyn's Lump, Pelsaert Gp. From 27m. (J.M. Huisman, 11.xi.l995; MURU, HA 1313). Remarks: This species was previously known as Rhodymenia australis, a superfluous name that has been recently replaced (Silva, Basson & Moe - Catalogue of the Benthic Marine Algae of the Indian Ocean, in press).

Genus: Webervanbossea De Toni f. 1936: 5. Webervanbossea splachnoides (Harvey) De Toni f. 1936: 6. Bindera splachnoides Harvey 1859: pl. CXI, figs 1-4 (non figs 5, 6). Reference: Huisman 1995. Type Locality: Garden Island, near Fremantle, Western Australia. Distribution: Houtman Abrolhos, Western Australia, around southern Australia to Port Phillip Heads, Victoria, and north-eastern Tasmania. Specimens: Coral Patches, Pelsaert Gp. From 20 m. (J.M. Huisman, 20.viii.1988; MURU, HA 321; 5.xii.1988; MURU, HA 318, 319, 320). Mostyns Lump, Pelsaert Gp. From 20-24 m. (J.M. Huisman & G.T. Kraft, 14.x.1990; MURU, HA 322 -duplicates in MELD) (J.M. Huisman, 29.ix.l991; MURU, HA 323). BENTHIC ALGAE OF THE HOUTMAN ABROLHOS 225

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