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03-M. Higuchi-3.02 Bull. Natn. Sci. Mus., Tokyo, Ser. B, 31(1), pp. 11–17, March 22, 2005 Studies on the bryophyte flora of Vanuatu. 8. Field studies in 2000 and 2001 and Haplomitriaceae and Treubiaceae (Hepaticae) Masanobu Higuchi Department of Botany, National Science Museum, Amakubo 4–1–1, Tsukuba 305–0005, Japan E-mail: [email protected] Abstract The second Botanical expedition of 2000 and 2001 to Vanuatu arranged by the Botani- cal Garden, National Science Museum, Tokyo was outlined with special reference to the collec- tions of bryophytes. Two hepatic families, Haplomitriaceae and Treubiaceae, are newly recorded from Vanuatu based on the collections made in 1996, 1997 and 2001. Ecological and taxonomic notes and figures of Haplomitrium blumii and Treubia insignis are presented. Key words : Haplomitriaceae, Treubiaceae, liverworts, Haplomitrium blumii, Treubia insignis, Vanuatu. In 2000 and 2001 the Botanical Garden, Na- This paper deals with taxa of the families Hap- tional Science Museum, Tokyo organized the lomitriaceae and Treubiaceae occurring in Vanu- second botanical expedition for studying the atu, based on the collections made by Higuchi in montane flora of Vanuatu in collaboration with 1996 and 2001 and by Mr. K. Sugimura in 1997 the Environment Unit and the Department of (cf. Higuchi 2002). Forestry of Vanuatu (cf. Iwashina et al. 2002). In The following descriptions are based on the October–November 2000 Mr. K. Sugimura col- plants from Vanuatu. lected bryophyte specimens as a member of the expedition, and Higuchi did in October–Novem- Haplomitriaceae ber 2001. Haplomitrium blumii (Nees) R.M.Schust., J. Hattori Bot. Lab., 26: 225 (1963). Study area in 2000 and 2001 Plants large, bright-green. Leafy shoots to Sugimura visited the islands of Espiritu Santo 7 cm long, arising from the lower part of older and Efate, and Higuchi stayed the islands of leafy shoots, growing upward after development, Tanna and Anatom Islands in addition to Espiritu erect or suberect, usually unbranched, anisophyl- Santo and Efate Islands. Collecting sites are lous, naked at the basal part. Rhizomes pale- shown in Fig. 1, and locations are described green to whitish, arising from the prostrate part below. Those of Espiritu Santo and Efate Islands of leafy stems, leafless. Leaves in three rows, were listed in Higuchi (2002). variable in size, erect-spreading in suberect leafy Tanna shoots, sometimes wide-spreading nearly at 90° 1. Lenakel (19°31ЈS, 169°16ЈE) in erect shoots, longer than broad, 3–4-stratose in 2. Loanialu (19°29ЈS, 169°20ЈE) a small but distinct median-basal part: lower Anatom leaves much smaller than upper ones. Lateral 1. Mt. Ukapaerek (20°10ЈS, 169°47ЈE ) leaves usually succubously inserted, transversely 2. Mt. Nidwon Nelcau (20°12ЈS, 169°49ЈE ) inserted only in suberect shoots, elliptic to lingu- 3. Anelghowhat (20°13ЈS, 169°46Ј) 12 Masanobu Higuchi Fig. 1. Outline map of Vanuatu. Collecting sites in Tanna and Anatom Isls. in 2001. late, broadly rounded at the apex, often narrowed smaller than bracts, lingulate with irregular at the base, 3.6–4.4ϫ2.4–2.6 mm at the middle shaped apex; slime papillae interspersed with an- part of the leafy shoot; margins entire; marginal theridia, usually mounted on a stalk of 1 cell, the cells not differentiated from median cells. Dorsal slime cell clavate to lump-shape. Calyptra long- leaves usually much smaller than lateral ones, tubular, smooth. Sporophyte not seen. transversely inserted, lingulate, 2.0–3.4ϫ0.9–1.6 Specimens examined. Espiritu Santo Isl., Mt. mm at the middle part of the leafy shoot. Vutimele (40 km north of Mt. Tabwemasana), Dioecious. Antheridia clavate with long 1100 m alt., on soil, Nov. 22, 1996 (Higuchi stalk, numerous, at shoot apex, in flat, dilated ter- 32078), on rock-cliff (Higuchi 32083e), on rotten minal disc; perigonial bracts ovate with more log, Nov. 24, 1996 (Higuchi 32202), on boulder acute apex but almost similar to lateral leaves, (Higuchi 32233), on decaying stump, Nov. 25, wide-spreading nearly at 90° at maturity; slime 1996 (Higuchi 32278), 1200 m alt., on rock-cliff, papillae interspersed with antheridia, usually Nov. 23, 1996 (Higuchi 32196); 2nd Camp — mounted on a stalk of 1 cell, the slime cell Mt. Vutimena (30 km north of Mt. Tabwe- clavate to lump-shape. Archegonia numerous, masana), 850 m alt., on soil, Oct. 18, 1997 (Sugi- with number and position similar to antheridia, in mura 1633). flat, dilated terminal disc; perichaetial bracts sim- Distribution. India, southern China, Malaysia ilar to lateral leaves but with obtuse lateral angu- (Malaya Peninsula), Sumatra, Java, Philippines lations, wide-spreading nearly at 90° at maturity; (Luzon, Mindanao) and New Guinea (cf. accessory bracts (bractlets) often present, much Bartholomew-Began 1991). New to Vanuatu. Bryophyte flora of Vanuatu. 8. Haplomitriaceae and Treubiaceae 13 Ecology. This species grows on shaded rock- tire, 6–9 mm long, 5–7 mm wide; unistratose cliff (2 specimens), boulder (1), decaying stump margin ca. 18 cells wide. Dorsal scales trans- (1), rotten log (1) and soil (1) at 850–1200 m in versely inserted, suberect or erect-spreading, humid montane forests. broadly semicircular, 1.5–2.0 mm long, 2–3 mm By the examination of above collections, Hap- wide. Dorsal scales near the axis apex with long, lomitrium blumii (Nees) R.M.Schust. was recog- obliquely decurrent wing on the axis. Cells of nized. The genus and the family are new to the axis, leaves and dorsal scales sometimes contain flora of Vanuatu. This species is characterized by a single large oil-body. Gemmae in axils of dor- its larger size (Fig. 2: A, B, Fig. 3: A) and basally sal scales and decurrent wing when present, 3–5- polystratose leaves (Fig. 2: G). celled, short-stalked. The genus Haplomitrium is rather widespread Dioecious. Archegonia in axils of dorsal in distribution, but most of the species are scales, mixed with slime papillae, sticky when very rare, restricted in range. According to young. Scale-like appendages in axils of dorsal Bartholomew-Began (1991), the genus consists scales rather far from the axis apex. Antheridia of seven species, a highly plastic, plesiomorphic and sporophytes not seen. taxon, probably of Gondwanian origin. It is no- Specimen examined. Espiritu Santo Isl., Mt. table that the genus occurs in the islands of Vanu- Tabwemasana, 1400 m alt., on rotten log, Oct. 23, atu which were newly formed by volcanic activi- 2001 (Higuchi 39874). ties. Distribution. Sumatra, Java, Philippines There were observed two types of male plants (Luzon) and Papua New Guinea (cf. Schuster with male inflorescences (ϭandroecia). The first 1969). New to Vanuatu. type has longer, suberect leafy shoots with suc- Ecology. This species grows on rotten log at cubously inserted lateral leaves (Fig. 2: A), and 1400 m in humid montane forest. the second one has shorter, erect leafy shoots The family Treubiaceae has never been report- with transversely inserted lateral leaves (Fig. ed from Vanuatu. Treubia insignis was found at 2: B). There is no difference of the number and Mt. Tabwemasana in Espiritu Santo Isl., which is position of antheridia between them. a new record for the flora of Vanuatu. Treubia Bartholomew-Began (1991) referred Andean species may generally be recognized in the field Haplomitrium andinum to the synonymy of H. by its unique shiny thick-green colour of plants. blumii. I cannot mention the relationship of both This species is characterized by its oil-cells simi- species here, because I do not have chance to ex- lar to other leaf cells in size (Fig. 4: C), dorsal amine any material of the former species. scales remote, inserted on a nearly transverse line and gemmae of 3–5-celled (Fig. 4: F). There is no protective structure for the sex or- Treubiaceae gans in all species of Treubia. In Vanuatu plants Treubia insignis K.I.Goebel, Ann. Jard. Bot. scale-like appendages were observed in axils of Buitenzorg, 9: 1 (1890). dorsal scales rather far from the axis apex (Fig. Plants large, thick-green, flat, prostrate, some- 4: H), where archegonia were not seen. Archego- times branched by lateral-intercalary branches; nia were probably unfertilized, shrivelled and dis- branches arising from the side of the axis beneath appeared (cf. Goebel 1930, Fig. 713: 13). The the posterior part of leaves, to 10 cm long, 2 cm shoot-calyptra with scale-like appendages (protu- wide. Axis ca. 25 cell rows high with a central berances) is known in some species of Treubia strand and cortical layers of small cells, slightly and Apotreubia (cf. Higuchi 1998). The scale- concave or flat dorsally, convex ventrally, bearing like appendages found on Vanuatu plants may rhizoids in a ventral rhizoid-bearing furrow. possibly be homologous with those of shoot-ca- Leaves slightly imbricate, broadly lingulate, en- lyptra. 14 Masanobu Higuchi Fig. 2. Male plants of Haplomitrium blumii. A, B. Plants with male inflorescence. Scalesϭ1 mm. C–E. Perigo- nial bracts. Scalesϭ1 mm. F. Antheridia. Scaleϭ0.5 mm. G. A part of cross-section of basal part of leaf. Scaleϭ0.2 mm. All taken from Higuchi 32202. Bryophyte flora of Vanuatu. 8. Haplomitriaceae and Treubiaceae 15 Fig. 3. Female plants of Haplomitrium blumii. A. Plants with female inflorescence. Scaleϭ1 mm. B. Leafy shoot apex with calyptra. Arrow shows calyptra. Scaleϭ1 mm. C–E. Perichaetial bracts. Scaleϭ1 mm. F. Bractlet. Scaleϭ1 mm. G. Female inflorescence without bracts. Scaleϭ0.5 mm. H. Archegonia. Arrow shows slime papilla. Scaleϭ0.2 mm. All taken from Higuchi 32202. 16 Masanobu Higuchi Fig. 4. Treubia insignis. A. Plants. Scaleϭ1 mm. B. Ventral view of tip of plant. Arrows show young branches. Scaleϭ5 mm. C. Apical margin of leaf. Arrow shows oil-cell. Scaleϭ0.1 mm. D. Axil of dorsal scale with archegonia and gemmae.
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