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3. Plants to 5 mm high; apices forcipate with sparse dichotomous branching; cortical band smooth at the edges, not curving upwards . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . C. zacae 3: Plants to 10 mm high; apices strongly circinate with dense and repeatedly dichotomous branching, cortical band bulging outwards at the edges and curving upwards . . . . . . . . . . . . . . C. mazatlanense Ceramium codii (Richards) Mazoyer 1938: 324; Taylor 1960: 526; Jaasund 1970b: 68, fig. IF, N, Dawes 1974: 145; Jaasund 1976: 107, fig. 216; Cribb 1983: 80, pl. 27, figs 1 4; Lewis 1984: 41; Millar 1990: 393, figs 41D-F; 43B; Yoshida et al. 1990: 300; Price and Scott 1992: 86, fig. 26A-D; Millar and Kraft 1993: 38. Ceramothamnion codii Richards 1901 : 264, pls 21, 22 (type locality: Bermuda). Ceramothamnion adriaticum Schiller 19 1 1 : 90. Ceramium serpens sensu Dawson 19626: 64, pl. 25, fig. 6 (vide Millar 1990: 393). (Figs 155a, b, 166) Plants epiphytic, bright red-maroon, up to 600 pm high and 29-47 pm in diameter. Branching straight, with rarely bifurcate tips and narrow cortical band. Axial cells elongate and slender, cylindrical, 51-54 pm long. Nodal cortical band 10-13 pm long, composed of one ring of larger, transversely elongate periaxial cells and 1 or 2 rings of irregularly arranged smaller cells. Acropetal and basipetal cortical cells single-layered, triangular to polygonal in surface view. Distribution Fiji, Australia, Japan, Caribbean, tropical Americas, Tanzania. Fijian Record New record for Fiji. Roturnan Distribution Hof6a (*H226/ USP S4: 14). Habitat and Remarks Epiphytic on Heterosiphonia subsecundata, the latter epiphytic on Melanamansia glomerata within tidal pools in middie reef. Ceramium mazatlanense Dawson 1950: 130, pl. 2, figs 14, 15 (type locality: Mazatlan, Sinaloa, Mexico); Dawson 1954: 448, fig. 55g-j; 1956: 53; 1957: 122; 1962: 59, pl. 23, figs 1, 2; Womersley and Bailey 1970: 324; Jaasund 1970b: 67, fig. 1A; 1976: 107, fig. 215; Tsuda and Wray 1977: 104; Ngan and Price 1979: 14; Lewis 1984: 42; Silva et al. 1987: 55; Abbott 1989: 230; Tsuda 1991: 49; South and Yen 1992: 129. (Figs 156, 157, 165) Thalli up to 10 mm high and 190 ym in diameter, arising from a creeping axis 200-250 pm in diameter attached to the substratum via hyaline rhizoids projecting from ventral nodal surfaces. Branching dense and repeatedly dichotomous, with strongly circinate apices. Cortication extensive, with narrow internodes 32-37 pm in middle of erect branches, becoming noticeably shorter (6-1 1 pm) towards the apex. Cortical bands 50-55 pm broad, bulging outward at the edges and curving upwards. Axial cells subglobular, 72-77 pm in diameter, from which arise a row of 6-8 periaxial cells giving rise to 2-3 rows of acropetally directed apical cells 5-10 pm in diameter, and a few basipetally directed irregularly disposed and angular axial cells 10-12 pm in diameter. Cystocarps 200-240 p.m in diameter, borne at dichotomies on branch apices. Carposporangia 25-35 pm in diameter.
Benthic Marine Algae of Rotuma Island 423 Distribution Fiji, Micronesia, Solomon Islands, Nauru, Hawaii, Australia, Philippines, Mexico, Tanzania. Fijian Records Garbary et al. 1991: 254 (as C. mazatlanse); South et al. 1993: 188. Rotuman Distribution Lopta (*L44/ USP S5: 1, *L56/ USP S7: 10). Habitat and Remarks Found within Jania rubens clumps, middle reef. Ceramium vagans PC. Silva in Silva et al. 1987: 56. Ceramium vagabundum Dawson 1957: 121, fig. 27e (as C. vagabunde) (type locality: Parry Island, Eniwetok Atoll, Marshall Island) (replaced name); Dawson 1954: 450, fig. 56b (as Ceramium sp.); 1962: 66, pl. 27 fig. 5; Tsuda and Wray 1977: 104; Lewis 1984: 43 (as C. vagabunde); Millar and Kraft 1993: 39 (as C. vagabunde). (Figs 154, 158, 159, 162) Thallus creeping, with erect monopodial branches 0.5-1.3 mm high and 133-180 ym in diameter, attached to the substratum via small hyaline rhizoids up to 250 Frn long and 35 p,m wide projecting from ventral nodal surfaces. Branch apices not circinate or forcipate, blunt to slightly fusiform. Axial cells globose to ovoid, 50-62 ym in diameter, giving rise to a row of 6-8 periaxial cells 15-20 ym in diameter from which arise 2-5 rows of progressively smaller, irregularly disposed acropetally directed apical cells and 1 or 2 rows of larger, basapetally directed angular apical cells 7-12 ym in diameter. Cortical band smooth at the edges, 45-50 ym wide with internodal spaces 72-75 ym long in middle of erect branches. Plants sterile. Distribution Fiji, Micronesia, Australia, Philippines, Vietnam, Mexico. Fijian Records Kapraun and Bowden 1978: 201; South and Kasahara 1992: 63 (both as C, vagabunde Dawson). Rotuman Distribution Lopta (*L42/ USP S5: 2, S7: 10). Habitat and Remarks Found with other Ceramium species within Jania rubens clump, middle reef. Ceramium zacae Setchell et Gardner 1937: 89, pl. 8 figs 22a-c (type locality: Bahia San BartolomC (Bahia Tortugas), Baja California Sur, Mexico); Dawson 1950: 134, pl. 2, figs 27-28; 1957: 8; 1962: 67, pl. 26, figs 4-6; Fortes and Trono 1979: 60, fig. 11; Silva et al. 1987: 56. (Figs 152, 153, 164) Thallus epiphytic, up to 5 mm high and 90-100 p,m in diameter, arising from prostrate filaments adhering by rhizoids from ventral nodal surfaces. Branching dichotomous, with
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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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