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Distribution Tropical Pacific and Indian Oceans. Fijian Records Garbary et al. 1991: 255; South and Kasahara 1992: 64 ( both as Heterosiphonia wurdemannii (Bailey ex Harvey) Falkenberg var. laxa). Roturnan Distribution Hapmafau (*HAP271 USP S5: 13). Habitat and Remarks Found as epiphytes on larger algae (e.g. Dictyota spp., Dictyopteris spp.) in sheltered tidal pools. Rotuman plants of this genus resemble var. laxa (Borgesen) Wynne but are noticeably smaller in axis diameter than those described in the literature (Taylor 1960; Dawson 1963). Heterosiphonia subsecundata (Suhr) Falkenberg 1901: 643, pl. 18, fig. 20. Dasya subsecundata Suhr 1840 (type locality unknown). Dasya subsecunda J. Agardh 1863: 118 1 (fide Falkenberg 1901) Heterosiphonia callithamnion Sonder; Parsons 1975: 61 7 vide Chapman 197 1: 170). Dasya callithamnion (Sonder) Harvey vide Chapman 197 1 : 170). (Figs 173, 174, 177, 179, 182, 183) Thalli up to 30 mm high, erect, with main axis 36-51 ym in diameter with 4 pericentral cells and bearing distichous, widely divaricating pseudolateral branches. Cells of pseudolateral branches 75-83 ym long and 25-35 ym broad. Tetrasporangial stichidia shortly pedicellate, fusiform, up to 225 ym long and 5 p,m in diameter, with distinct apical cell up to 10 ym high and borne laterally from thallus main axis. Tetrasporangia 15-25 km in diameter, irregularly disposed within stichidia. Carpogonium pedicellate, up to 116 krn high and 88 ym broad, bearing subrectangular carposporangia up to 8 ym in diameter. Distribution Fiji, tropical seas. Fijian Records Chapman 1971: 170 (as H. subsecunda); South and Kasahara 1992: 64. Rotuman Distribution Hofia (*H226/ USP S4: 14, *H228/ USP S4: 15); Ropure (*R2/ USP S5: 11). Habitat and Remarks Found as epiphytes on Melanamansia glomerata, middle reef. Delesseriaceae Hypoglossum Kiitzing 1843: 444 Hypoglossum caloglossoides Wynne and Kraft 1985: 20, figs 1-19 (type locality: Lord Howe Island, Australia); Price and Scott 1992: 137, fig. 47A-C; Millar and Kraft 1993: 46. Caloglossa vieillardii Setchell 1924: 161 (non Hypoglossum vieillardii Kiitzing 1866: 4). Caloglossa leprieurii f. pygmaea auct. non (von Martens) Post sensu Dawson 1956: 57, fig. 59; Womersley and Bailey 1970: 327; Wynne and Kraft 1985.
Benthic Marine Algae of Rotuma Island (Figs 176, 178, 180, 184) Plants delicate, creeping, up to 10 mm long and with regular patterns of constrictions (nodes and internodes) which are potential points of attachment of thallus to the substratum via multicellular holdfasts composed of numerous rhizoids terminating in subpeltate knobs. Blades up to 0.6 mm wide, with branching endogenous from the thallus midrib. A transversely dividing cell terminates each axis or blade, with all 3rd-order initials reaching the thallus margin, and all cells of the 2nd-order cell row bear 3rd-order rows. Blade edges monostromatic, with radial line composed of an axial cell plus 4 pericentral cells. Plants sterile. Distribution Lord Howe Island, Samoa, southern Marshall Islands, Solomon Islands, Australia. Fijian Record N'Yeurt et al. 1996b. Rotuman Distribution Tua'koi (*TI71 USP S4: 13). Habitat and Remarks Found creeping on Acropora coral rubble on outer reef. There appears to exist much confusion in the literature between the genera Caloglossa and Hypoglossum, and this calls for a re-examination of other records of Caloglossa from deep-water habitats in the South Pacific (see Wynne and Kraft 1985). Martensia Hering 184 1 : 92 Martensia elegans Hering 1841: 92 (type locality unknown); Harvey 1847: 73, pl. 43; Weber-van Bosse 1923: 386; Kylin 1956: 449; Jaasund 1976: 1 19, fig. 242; Tsuda and Wray 1977: 109; Lewis 1984: 46; Garrigue and Tsuda 1988: 66; Millar 1990: 417, fig. 53A, B; Millar and Kraft 1993: 47. Hemitrema elegans R. Brown 1843. Mesotrema elegans J. Agardh 1854: 110. (Fig. 131) Plants with soft pinkish-red lobes; 15-30 mm high. Periodic intercalary growth producing grid-like network, the grids being the edges of bands extended at right angles to the plane of the blades, and interconnected by anastomosing filaments from the grid walls. Plants sterile. Distribution Fiji, New Caledonia, Micronesia, Australia, Indonesia, Tanzania. Fijian Records South 1991: 9; in Herb. Institute of Marine Resources, University of the South Pacific (USP 3 13). Rotuman Distribution Hapmafau (HAP241 USP 350). Habitat and Remarks Tidal pool, middle reef.
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31 July 1996 Australian Systematic
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Benthic Marine Algae of Rotuma Isla
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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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