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A Middle-Late Eocene Inflorescence Of View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by University of Tasmania Open Access Repository American Journal of Botany 90(5): 761±768. 2003. AMIDDLE-LATE EOCENE INFLORESCENCE OF CARYOPHYLLACEAE FROM TASMANIA,AUSTRALIA1 GREGORY J. JORDAN2 AND MICHAEL K. MACPHAIL3 School of Plant Science, University of Tasmania, Private Bag 55, Hobart 7001, Tasmania, Australia A new genus and species (Caryophyllo¯ora paleogenica genus and species nova G. J. Jord. & Macphail) are proposed for a fossil in¯orescence found in Middle-Late Eocene sediments at Locharbour, northeastern Tasmania, Australia. A parsimony analysis of 75 extant species of the order Caryophyllales and ®ve outgroups placed the fossil within Caryophyllaceae, either subfamily Alsinoideae or Caryophylloideae. The analysis used molecular (rbcL and/or matK), morphological, and anatomical data for the extant species and morphological data for the fossil. Tests on extant species imply that the placement of the fossil should be convincing. The fossil appears to be of a lineage distinct from any extant Australian Caryophyllaceae. In situ pollen are consistent with the form species, Periporopollenites polyoratus. This relatively simple pollen type ®rst appears in Australia and New Zealand in the Late Cretaceous, the oldest known record of the Caryophyllaceae. The last appearance of P. polyoratus in Australia is in the Oligocene, and extant Australian members of the Caryophyllaceae are best interpreted as having evolved from species that dispersed from elsewhere during the Neogene or Quaternary. Key words: Antarctica; Australia; Caryophyllaceae; Centrospermae; Eocene; fossil; Paleogene; phylogeny; pollen. The Caryophyllaceae is a large, cosmopolitan family of 86 Partridge 1973 has the longest geological range of fossil pollen genera and about 2200 species of herbs and small shrubs (Bit- types assigned to Caryophyllaceae. Its earliest record is Late trich, 1993). Only three of the genera are large shrubs or small Campanian from the Gippsland and Otway Basins in southeast trees, Sanctambrosia, endemic to San Ambrosio Island, Chile, Australia (Stover and Partridge, 1973) and South Island, New and the Hawaiian endemics, Alsinidendron and Schiedea (Bit- Zealand (Raine, 1984). Its last recorded appearance is Oligo- trich, 1993). The family is included in the order Caryophyl- cene. Younger records of Periporopollenites that may be de- lales, which Cronquist (1981) de®ned to contain about 600 rived from members of Caryophyllaceae are morphologically genera and 10 000 species. This is a monophyletic group distinct species. They include Oligocene specimens of P. pal- (Cuenod et al., 2002). Cactaceae, Aizoaceae, Amaranthaceae, lidus and P. vesicus (Nott and Owen, 1992), Early Miocene and Portulacaceae are other large families in the same order. specimens of P. vesicus and two undescribed Periporopollen- Savolainen et al. (2000) de®ned Caryophyllales more broadly ites species (Owen, 1988), and an undescribed Early-?Middle but this work will use Cronquist's (1981) narrow de®nition. Miocene grain (Tulip et al., 1982). The fossil record of the family is sparse, with published pre- Caryophyllaceae-type pollen ®rst appears in Europe in the Pleistocene records consisting almost exclusively of pollen. Miocene (Muller, 1981). This late appearance is surprising Most Caryophyllaceae have more or less spherical, periporate, considering the much higher diversity of the family in the spinulose, microechinate or microreticulate annular perforate or punctate pollen with simple apertures (Nowicke, 1994; Punt Northern Hemisphere (Bittrich, 1993) and the earlier Southern and HoÈen, 1995). Fossil pollen matching this description are Hemisphere records. Eocene seeds from England, Hantsia pul- included in Periporopollenites P¯ug & Thompson in Thomp- chra and H. glabra (Chandler, 1961, 1963), have been attri- son & P¯ug 1953, Malvacipollis and Chenopodipollis buted to the family. These are the only macrofossil records of Krutzsch 1966. Periporopollenites includes pollen previously the family, but their taxonomic status is uncertain (Chandler, assigned to Periporites Van der Hammen 1956, Caryophylli- 1961). dites Couper 1960, Parsonsidites Couper 1960, Liquidambar- Morphological convergence means that the pollen records pollenites Ratz 1937 ex Potonie 1960, Polyporina Naumova of Caryophyllaceae need to be interpreted carefully. All the 1939 ex Potonie 1960, Caryophyllaceaepites Biswas 1962, features of typical Caryophyllaceae pollen occur in other fam- and Chenopodipollis. Malvacipollis and Chenopodipollis are ilies of the order, notably Amaranthaceae, Rivinaceae, and still in use, but now only encompasses pollen of Euphorbi- Nyctaginaceae. Periporate pollen also occurs in unrelated fam- aceae and Amaranthaceae (de®ned to include Chenopodi- ilies such as Papaveraceae, Convolvulaceae, Euphorbiaceae, aceae), respectively (Truswell et al., 1985). and Hamamelidaceae. Periporopollenites polyoratus (Couper 1960) Stover and This work describes a fossil in¯orescence from Middle-Late Eocene sediments at Locharbour, northwestern Tasmania, Aus- 1 Manuscript received 1 August 2002; revision accepted 21 November tralia, and the relationships of the in situ pollen with dispersed 2002. The authors thank Phillipe Cuenod for molecular data; Alan Partridge for fossil pollen types. Recent progress in understanding angio- pollen specimens and discussion, David Steele of the Central Science Labo- sperm evolution has been made by determining the relation- ratory, University of Tasmania, for help with electron microscopy, Jane Fran- ships of extinct species to living taxa without forcing fossils cis for advice on sedimentology at Locharbour, Laurie Adams, Judy West, into extant genera or families (Dilcher, 2000). This work there- Robert Hill, and Andrew Rozefelds. fore uses a phylogenetic analysis to determine the relationships 2 Author for reprint requests (e-mail: [email protected]). 3 Current address: Department of Archaeology and Natural History, Re- of the fossil to extant groups. Formal phylogenetic analysis search School of Paci®c and Asian Studies, Australian National University, was necessary because of extensive morphological homoplasy Canberra 0200, A. C. T. Australia. within the order. 761 762 AMERICAN JOURNAL OF BOTANY [Vol. 90 TABLE 1. Morphological, anatomical, and biochemical characters and TABLE 1. Continued. states. All multistate characters were treated as unordered. Character States Character States 22. Sieve element plastid 0 5 without protein ®laments 1. In¯orescence 0 5 not dichasial 1 5 peripheral ring of protein ®la- 1 5 dichasial ments present 2. Paired ¯oral bracts 0 5 absent 23. Sieve element plastid crystals 0 5 absent 1 5 present 1 5 globular 2 polygonal/angular/cuboidal 3. Flowers 0 5 bisexual 5 1 5 unisexual 4. Perianth 0 5 with both petals and sepals 1 5 with sepals only 5. Calyx merosity 0 5 pentamerous MATERIALS AND METHODS 1 5 pleiomerous Fossil site and paleoenvironmental contextÐThe fossil came from a lens 2 5 trimerous 3 5 tetramerous of laminated siltstone in gravel exposed in the Locharbour tin mine in north- eastern Tasmania (408569160 S, 148809340 E, 60 m a.s.l.). The siltstone is 6. Calyx parts 0 5 free consistent with a cut-off channel in a braided stream deposit. The sediments 1 5 fused are part of extensive mid-Cretaceous-early Neogene freshwater deposits in the 7. Stamen position 0 5 unassociated with calyx region (Baillie, 1989). The associated palyno¯ora falls in the Lower Notho- 1 5 episepalous/pseudo-obdiplos- fagidites asperus zone of Stover and Partridge (1973), implying a Middle or temonous possibly Late Eocene age. 2 5 alternisepalous The living relatives of fossil species at Locharbour and coeval sites suggest 8. Androecium 0 5 numerous parts that ¯oristically the vegetation at the time of deposition was diverse, cool 1 5 same number of elements as climate rainforest dominated by genera with extant species in temperate and calyx tropic-montane rainforests (Carpenter et al., 1994; Macphail et al., 1994). The 2 5 twice as many elements as ca- Locharbour fossil ¯ora includes the conifers Phyllocladus aberensis (Hill, lyx 1989), Willungia oppositifolia (Hill and Pole, 1992), Acmopyle tasmanica, 9. Filaments 0 5 ®liform Dacrycarpus mucronatus (Hill and Carpenter, 1991), and Araucaria (Carpen- 1 5 subulate/tapering ter et al., 1994), and the angiosperms Eucryphia aberensis (Barnes and Jordan, 10. Stamens 0 5 all free 2000) and Banksieaephyllum attenuatum (Hill and Christophel, 1988). 1 5 fused into bundles 11. Stamen number 0 5 multiple of calyx elements Specimen preparationÐOne partial in¯orescence was found by manually 1 5 number reduced splitting a block of sediment. Brushing the block with a ®ne brush under 2 5 indeterminate running water exposed this fossil progressively. Some individual anthers were 12. Anther attachment 0 5 dorsi®xed squashed on glass slides and mounted in phenol glycerine jelly for light mi- 1 5 basi®xed croscopy. Others were soaked in 50% hydro¯uoric acid for approximately 1 h to remove residual sediments, then placed on double-sided conductive tape 13. Fusion of ¯oral whorls 0 5 free 1 5 anthers fused to free perianth on aluminum stubs. These were sputter coated with gold to approximately 40 parts nm thick and observed under high vacuum with an ESEM 2020 Environ- 2 5 perigynous mental Scanning Electron Microscope (ElectroScan, Wilmington, Massachu- 3 5 epigynous setts, USA). 14. Pollen aperture type 0 5 furrows
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