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Benthic Marine Algae of Rotuma Island<br />

Acrochaetium hallandicum (Kylin) Hamel 1927: 20, 82; Silva et al. 1987: 19.<br />

Audouinella hallandica (Kylin) Woelkerling 1973: 82, figs 14; Schneider 1983: 9.<br />

Acrochaetium sargassi Borgesen 19 15: 17, fig. 7-10 (Type locality: St Thomas, Virgin Is;<br />

vide Woelkerling 1973: 84); Weber-van Bosse 1921: 193; Taylor 1928: 134, pl. 22 figs 1-5;<br />

1960: 306; Womersley and Bailey 1970: 301.<br />

(Fig. 119)<br />

Plants epiphytic, up to 415 ym high, with inconspicuous sporal basal cell giving rise to<br />

1-2 axes. Erect filaments 7-10 p,m in diameter, irregularly branched with individual cells<br />

cylindrical, generally 2 diameters long, with parietal lobate chromoplast. Monosporangia<br />

ovoid, 7-8 I-Lm wide and 9-10 pm long, borne on short side branchlets adaxially disposed<br />

over the erect filaments.<br />

Distribution<br />

Tropical oceans.<br />

Fijian Records<br />

New record for Fiji.<br />

Rotuman Distribution<br />

Hapmafau (*HAP411 <strong>USP</strong> S4: 7).<br />

Habitat and Remarks<br />

Epiphytic on Gelidium pusillum within algal carpets on exposed rock.<br />

Bonnemaisoniales<br />

Galaxauraceae<br />

Actinotrichia Decaisne<br />

Actinotrichia fragilis (Forsskil) Borgesen 1932: 6; Yamada and Tanaka 1938: 69;<br />

Dawson 1954: 416, fig. 28b; 1956: 46; Durairatnam 1961: 49; Trono 1969: 45; Womersley<br />

and Bailey 1970: 302; Jaasund 1976: 65, fig. 131; Tsuda and Wray 1977: 103; Magruder and<br />

Hunt 1979: 57; Cribb 1983: 25, pl. 8, fig. 1; Lewis 1984: 5; Tseng et al. 1984: 58, pl. 32,<br />

fig. 1; Payri and Meinesz 1985a: 511; Lewis and Norris 1987: 15; Silva et al. 1987: 22;<br />

Garrigue and Tsuda 1988: 63; Coppejans and Prud'homme van Reine 1992a: 18 1; Ohba and<br />

Enomoto 1992: 30; Verheij and Prud'homme van Reine 1993: 167, pl. 14, fig. 1.<br />

Fucus fragilis Forsskdl 1775: 190 (type locality: Mokha, Yemen).<br />

Actinotrichia rigida (Lamouroux) Decaisne 1842: 18; Montagne 1844: 659; Dickie<br />

1874a: 196, 244; Okamura 1916(1916-1923): 30, pl. 158, figs 17-19; Weber-van Bosse<br />

1921: 207, pl. 6 figs 1-2; Lewis 1984: 5; Payri and Meinesz 1985~: 51 1.<br />

Galaxaura rigida Lamouroux 1816: 26, pl. 8, fig. 4 (Type locality: 'la mer des Indes').<br />

(Fig. 113)<br />

Plants up to 2 cm high, reddish-brown in colour, forming dichotomously branched thalli;<br />

angle of branching 30-40" below, 85-90" at the tips. Segments terete, 380-440 ym in<br />

diameter, provided with characteristic closely-spaced, annular pigmented hair-like filaments<br />

3-6 ym thick. Collections sterile.<br />

Distribution<br />

Tropical Indian and Pacific Oceans.

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