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Benthic Marine Algae of Rotuma Island<br />

(Fig. 61)<br />

Thallus yellow-green, up to 7 mm high and 5 mm broad, fan-shaped blade rounded at<br />

outer margins and cuneate at base. Thallus consisting of a single layer of parallel filaments<br />

35-40 pm broad (outer margins) to 80-105 pm broad (base of thallus) with characteristic<br />

unequal constrictions above each dichotomy. Stipe up to 200 pm in diameter, filamentous<br />

and uncorticated, mostly uncalcified and monosiphonous. Stipe anchored by fine, translucent<br />

hyaline rhizoids.<br />

Distribution<br />

Tropical Pacific and Indian Oceans, Caribbean.<br />

Fijian Records<br />

Kasahara 1985: 24; 1988 (as Udotea javensis); South 1991: 5; South and Kasahara 1992: 52.<br />

Rotuman Distribution<br />

Tua'koi (*TI21 <strong>USP</strong> S5: 16).<br />

Habitat and Remarks<br />

Middle reef, epiphytic on Dictyota friabilis. This genus has been re-established by Littler<br />

and Littler (1990), for the widespread Udotea javensis (Montagne) A. Gepp and E.S. Gepp.<br />

<strong>The</strong>y note that the anastomosing siphons reported by Montagne (1842~) as characteristic of<br />

Rhipidosiphon javensis is incorrect, and that the latter genus differs from Udotea by its<br />

monosiphonous and partly uncalcified stipe. <strong>The</strong>y consider that Gepp and Gepp's (1904)<br />

placement of Rhipidosiphon javensis within the genus Udotea is based on insufficient<br />

derived characters.<br />

Rhipilia Kiitzing 1858<br />

Rhipilia orientalis A. et E.S. Gepp 1911: 57, pl. 16, figs 134-136; Weber-van Bosse<br />

1913a: 115; Taylor 1950: 72, pl. 36, fig. 1; Dawson 1956: 40; 1957: 108; Moul 1957: 44;<br />

Trono 1968: 177, pl. 19, fig. 1; Womersley and Bailey 1970: 279; Tsuda and Wray 1977: 99;<br />

Lewis 1987: 33; Coppejans and Prud'homme van Reine 1989: 131, pl. 6, figs 1-18; Verheij<br />

and Prud'homme van Reine 1993: 140, pl. 7, fig. 2.<br />

(Figs 52a, b, 62, 64a-c)<br />

Thallus up to 35 mm high, composed of a stipitate blade up to 30 mm broad tapering into<br />

a stalk up to 15 mm long and 2 mm in diameter. Blade siphons 20-35 pm in diameter, with<br />

alternate appendages up to 147 pm long terminating in 2-4 irregular prongs.<br />

Distribution<br />

Indonesia, Micronesia, Solomon Islands, north Australia.<br />

Rotuman Distribution<br />

Ropure (R5/ <strong>USP</strong> 619); Hof6a (<strong>USP</strong> 777).<br />

Habitat and Remarks<br />

Growing in sandy tidal pools on outer reef, at 1-2 m.

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