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esulting in the forks appearing nearly parallel to each other. Branches 115-170 pm in diameter, composed of segments 320-410 Fm long held together by flexible joints. Tetrasporangial conceptacles terminal and vasiform; spermatangial conceptacles terminal, lanceolate to fusiform. Cystocarps not seen. Distribution Fiji, Bikini Atoll, Tuvalu, Tahiti, Solomon Islands, Micronesia, Lord Howe Island, northern Australia, Philippines, Japan, Caribbean, Greece. Fijian Records New published record; in Herb Bishop Museum, Hawaii (BISH 535460,535461). Rotuman Distribution Lopta (L411 USP 560). Habitat and Remarks Grows as tightly-packed clumps attached to rocks or coral debris, on the outer reef and in tide pools. Lithophyllum Philippi 1837: 389 Lithophyllum tamiense Heydrich 1897: 1, figs 4-7 (type locality: Tami Island, Papua New Guinea).Verheij 1993: 43, figs 19-26; Verheij and Prud'homme van Reine 1993: 179. Lithophyllum tamiense Heydrich 1897: 1; 1901: 419; Foslie 1900a: 16; 1901c: 17; Woelkerling and Campbell 1992. Lithothamnion moluccense Foslie 1897: 12. Lithophyllum moluccense (Foslie) Foslie 1901a: 12; 1901b: 17; 1904: 65-69; Gordon et al. 1976: 270-272. Goniolithon moluccense (Foslie) Foslie 1898: 8; 1900b: 10, 11; 1901b: 17. Lithothamnion pygmaeum Heydrich 1897: 3. Goniolithon pygmaeum (Heydrich) Foslie 1898: 8. Lithophyllum torquescens Foslie 1901a: 1 1; 1901c: 23, 24. Lithophyllum moluccense f, torquescens Foslie 1904: 69,70. (Fig. 115) Plants to 5 cm high; crustose base bearing cylindrical branches up to 8 mm long and 2 mm in diameter, with rounded ends. Thallus pseudoparenchymatous; cells of adjacent filaments connected by secondary pit connections. Filaments terminated by a single, larger, rounded epithallial cell 9-10 Fm in diameter and 3-5 km long, and 1 subepithallial meristematic cell producing new epithallial cells outwardly or additional vegetative cells inwardly. Tetrasporangial conceptacles 300-325 pm in diameter and 120-130 pm in height; conceptacle floor 7-8-cells below thallus surface with conceptacle roof 3-4 cells thick. Columella well developed, with conceptacle raised about 50% from thallus surface. Old and empty conceptacles buried. Distribution Tropical Indo-Pacific, West Indies. Fijian Records New record for Fiji.
Benthic Marine Algae of Rotuma Island Rotuman Distribution Common at most sites. Representative material: Kelega (K2/ USP 616). Habitat and Remarks On the exposed outer reef, where it occurs as more or less eroded concretions attached to the coral rubble. Gigartinales Gracilariaceae Gracilaria Greville 1830: 121 Gracilaria sp. aff. G. textorii (Suringar) De Toni 1895: 27; Xia and Yamamoto 1985: 69, figs 24-31; Millar and Kraft 1993: 28. Thallus foliose, consisting of irregularly dichotomous blades with rounded apices and smooth margins. Medullary cells ovate to ovoid, 80-125 pm in diameter; cortex distromatic, the outermost layer of pyriform to spherical cells 8-12 pm in diameter, the inner layer of ovate to spherical cells 30-50 pm in diameter. Plants sterile. Rotuman Distribution Maka Bay (MAK20/ USP 614). Habitat and Remarks Growing abundantly within the seagrass beds in Maka Bay, in association with Sargassum polycystum and Enteromorpha jlexuosa. Owing to a lack of fertile material, this species of Gracilaria cannot be definitively identified. However, from its habit and internal structure it most closely resembles G. textorii (Suringar) De Toni. Hypneaceae Hypnea Lamouroux 18 13: 13 1 Hypnea nidulans Setchell 1924: 161, fig. 30 (type locality: Tutuila Island, American Samoa); Weber-van Bosse 1928: 454, fig. 192; Okamura 1931: 114; Tanaka 1941: 246, figs 18, 19; Dawson 1954: 438, fig. 46e-g; 1957: 115; Tsuda 1964: 9; Jaasund 1976: 97, fig. 197; Tsuda and Wray 1977: 108; Lewis 1984: 35; Payri and Meinesz 1985a: 512; Lewis and Norris 1987: 20; Silva et al. 1987: 50. Hypnea nidulans is included within H. pannosa J. Agardh (1847: 14) by the following authors: Womersley and Bailey (1970: 319); Kasahara (1985: 62); Tsuda (1991: 54); Price and Scott (1992: 38), but both species are recognised by Silva et al. (1987: 50). (Fig. 136) Thallus purple-pink, up to 2 cm high, with mostly terete axes up to 1 mm broad. Branching irregular, with arcuate tendency for the axis and branches. Branches not constricted at the base, terminating in sharply acute apices. Medulla up to 740 pm in diameter, consisting of a central axial cell giving way radially to medullary cells up to 200 p,m in diameter. Lenticular thickenings present in some medullary cells. Inner cortical cells 23-30 ym in diameter; pigmented epidermal cells 8-9 pm in diameter. Apical cell single, prominent, up to 10 p,m in diameter.
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31 July 1996 Australian Systematic
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Benthic Marine Algae of Rotuma Isla
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Fig. 122. Peyssonnelia sp. Cross-se
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A. D. R. N'Yeurt Fig. 136. Hypnea n
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A. D. R. N'Yeurt Fig. 148. Centroce
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A. D. R. N'Yeurt Fig. 156. Ceramium
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A. D. R. N'Yeurt Fig. 168. Grzffith
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Fig. 181. Heterosiphonia crispella
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Fig. 188. (a, b) Chorzdria dasyphyl
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Fig. 200. Herposiphonia secunda f.
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Rotuman Algal Flora Composition At
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CENTRAL AND SOUTHWESTERN PACIFIC RE
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