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Habitat and Remarks Found in sheltered back reef sites, often underneath flat coral rubble and in tide pools. Valonia C. Agardh 1822 Valonia aegagropila C. Agardh 1822a: 429 (lectotype locality: Venezia, Italyfide Egerod 1952: 348); J. Agardh 1887: 99; Weber-van Bosse 1913a: 60; Taylor 1950: 41; Egerod 1952: 348, pl. 29b; Dawson 1954: 388, fig. 8j; Chapman 1955: 355; Dawson 1956: 28; 1957: 101; Moul 1957: 44; Levring 1960: 121; Taylor 1960: 1 1 1, pl. 17, fig. 6; Chapman 1961: 98, fig. 11 1; Gilbert 1961: 418; Tsuda 1964: 7; Taylor 1966: 347; Trono 1968: 156; 1986: 212, fig. 6; Womersley and Bailey 1970: 266; Jaasund 1976: 15, fig. 29; Taylor 1977: 8; Tsuda and Wray 1977: 100; Magruder and Hunt 1979: 33; Ngan and Price 1979: 5; Dong and Tseng 1984: 270, pl. 134, fig. 3; Lewis 1987: 8; Lewis and Norris 1987: 11; Silva et al. 1987: 102; Olsen and West 1988: 104, fig. 6; Abbott 1989: 225; Littler et al. 1989: 58; Tsuda 1991: 44; Coppejans and Prud'homme van Reine 1992a: 171; Ohba and Enomoto 1992: 28; South and Yen 1992: 127; Verheij and Prud'homme van Reine 1993: 145, pl. 8, fig. 3. (Fig. 15a, b) Thallus encrusting, dark to light olive-green, composed of vesicle-like subclavate segments 3-13 mm long and 2-5 mm broad, subdichotomously branched from the sides or the ends of the cells. Young plants attached to each other, the older ones more or less free. Can form thick encrusting mats up to 10 mm thick over many m2 of back reef rocks. Distribution Tropical oceans. Fijian Records Kapraun and Bowden 1978: 200; Kasahara 1985: 35, pl. 5, fig. 3; 1988; South and Kasahara 1992: 48. Rotuman Distribution Hapmafau (HAP221 USP 343, HAP231 USP 344). Habitat and Remarks Smaller specimens (1-2 mm long) form extremely dense encrusting mats on exposed beach rocks in backreef sites (eg. Hapmafau). The Valonia mats are typically covered with dark green Cyanophyceae (Lyngbya sp.) and offer a micro-habitat for a large variety of smaller red, green and blue-green algae (e.g. Heterosiphonia, Cladophora, Ceramium). The larger plants (3-5 mm long) are typically found in more or less free clusters at the base of rocks and coral rubble in sandy back reef sites. Ventricaria Olsen et West 1988 Ventricaria ventricosa (J. Agardh) Olsen et West 1988: 104; Garrigue and Tsuda 1988: 61; Littler et al. 1989: 56; Tsuda 1991: 44 (as Ventricularia ventricosa); Coppejans and Prud'homme van Reine 1992a: 172; Ohba and Enomoto 1992: 28; Verheij and Prud'homme van Reine 1993: 146; Wynne 1993: 21. Valonia ventricosa J. Agardh 1887: 96 (syntype localities: St. Croix, Virgin Island; Guadeloupe); Okamura 1936(1933-1942): 32, fig. 13; Egerod 1952: 347, pl. 29a; Dawson 1954: 388, fig. 8e; Dawson 1956: 28; 1957: 101; Chapman 1955: 355; Levring 1960: 121; Taylor 1960: 110, pl. 9, figs 4-5; 1966: 347; Chapman 1961: 95, fig. 109; Meiiez 1961: 48; Trono 1968: 155; Valet 1968: 35; Womersley and Bailey 1970: 267; Dawes 1974: 92;
Benthic Marine Algae of Rotuma Island 373 Jaasund 1976: 13, fig. 27; Woelkerling 1976: 100, fig. 65; Chapman 1977: 161; Tsuda and Wray 1977: 100; Magruder and Hunt 1979: 35; Dong and Tseng 1984: 272, pl. 135, fig. 1; Payri and Meinesz 1985a: 510; Trono 1986: 213, fig. 7; Lewis 1987: 8; Santelices and Abbott 1987: 5; Silva et al. 1987: 103; Abbott 1989: 225. (Fig. 23) Plants coenocytic and thin-walled dark green in colour, subsperical, up to 25 mm in diameter. Grows solitarily or in groups of 3 or 4; attached basally to the substratum by minute rhizoids. Distribution Tropical oceans. Fijian Records Chapman 1971: 165 (as Valonia ventricosa J. Agardh); Kasahara 1985: 36; 1988 (as Valonia ventricosa J. Agardh); South 1991: 4; South and Kasahara 1992: 49. Rotuman Distribution Hof6a (H2211 USP 345). Habitat and Remarks Plants occur on back reef, under flat pieces of coral rubble. Bryopsidales Bryopsidaceae Bryopsis Lamouroux 1809 Key to the Rotuman Species of Bryopsis 1. Plants not tufted, in compact clumps 12-20 mm high; branchlets in a pair of offset lateral rows on one side of the primary axis ............................................... B. harveyana 1: Plants tufted, in lax clumps to 6 cm tall; branchlets in 2 opposite rows along central axis .......... ....................................................................... B. plu~no~a Bryopsis harveyana J. Agardh 1887: 82; Okamura 1931: 100; Yamada and Tanaka 1938: 60; Borgesen 1946: 36, Fig. 13; Tsuda and Wray 1977: 94; Dong and Tseng 1984: 280, pl. 139, fig. 1; Payri and Meinesz 1985a: 507; Lewis and Norris 1987: 10; Garrigue and Tsuda 1988: 57; Tsuda 1991: 40. Bryopsisplumosa var. secunda Harvey 1858: 31, pl. 45A, figs 1-3 (type locality: Friendly Islands,fide J. Agardh 1887: 22). (Fig. 48) Thallus dark iridescent green; in compact clumps 12-20 mm high and 15 mm broad; main axis 195-200 pm in diameter and unbranched, with slight upward curvature. Secondary branches cylindrical to clavate, up to 1000 km long and 85 pm broad, with rounded apex and slight constriction (35-41 pm) at base. Branchlets occurring in an offset pair of lateral rows on one side of the primary axis, giving a uniseriate appearance to the thallus. Secondary branchlets typically longer in middle of axis, imparting a renoid curvature to the younger blades.
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Benthic Marine Aigae 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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