Download (6Mb) - USP Electronic Research Repository - The ...

Benthic Marine Algae of Rotuma Island 37 1
Habitat and Remarks
Plants form small mats or clumps in sheltered tidal pools (Fapufa, Hapmafau), where
filaments reach 100 pm in diameter; or coarser forms in tufts to 15 mm high infiltrated with
calcareous mud and sand, composed of sometimes laterally anastomosing filaments up to
176 pm in diameter (at 'Ahau, where it is the dominant algal cover on coral debris along the
shoreline).
The Rotuman specimens at 'Ahau closely fit the habitat description by Taylor (1950: 44),
who most probably refers to this species under C. zollingeri (Kiitzing) Borgesen, as his Bikini
specimens attain up to 175 pm in diameter. The type specimen of C. zollingeri has filaments
in the range of 215-315 pm in diameter, in contrast to the filaments of C. sundanensis which
range from 60-175 pm in diameter (see Howe 1914; Dawson 1956: 31).
Valoniaceae
Dictyosphaeria Decaisne ex Endlicher 1843
Dictyosphaeria cavernosa (Forsskll) Borgesen 1932: 2, pl. 1, fig. 1; Setchell 1935: 261;
Yamada and Tanaka 1938: 54; Gilbert 1946: 77; Taylor 1950: 43, pl. 27, fig. 2; Egerod
1952: 350, figs lb-- 2f-g; Dawson 1954: 388, fig. 8i; Chapman 1955: 355; Dawson 1956:
29; 1957: 102; Moul 1957: 42; Levring 1960: 121; Taylor 1960: 116, pl. 7, fig. 5; Chapman
1961: 98, fig. 1 l4a, b; Durairatnam 1961: 29; Gilbert 1961: 417; Meiiez 1961: 48; Tsuda
1964: 6; Taylor 1966: 348; Trono 1968: 157; Tsuda and Trono 1968: 194; Valet 1968: 35;
Womersley and Bailey 1970: 267; Jaasund 1976: 15, fig. 32; Tsuda 19766: 328; Woelkerling
1976: 96, Fig. 45; Tsuda and Wray 1977: 96; Magruder and Hunt 1979: 27; Dong and Tseng
1984: 268, pl. 133, fig. 5; Payri and Meinesz 1985a: 509; Trono 1986: 212, fig. 5; Lewis
1987: 7; Lewis and Norris 1987: 10; Silva et al. 1987: 101; Garrigue and Tsuda 1988: 59;
Abbott 1989: 225; Littler et al. 1989: 62; Tsuda 1991: 42; 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: 144; Millar and Kraft 1994b: 431.
Ulva cavernosa Forsskll 1775: 187 (syntype localities: 'Gomfodae' (Al-Qunfidha), Saudi
Arabia; Mokha, Yemen).
Valonia favulosa C. Agardh 1822a: 432 (type locality: 'Ravak' (Lawak); Waigeo Island,
Moluccas, Indonesia).
Dictyosphaeria favulosa (C. Agardh) Decaisne ex Endlicher 1843: 18; Dickie 1876: 244;
Okamura 1908(1907-1909): 205, pl. 40, figs 13-204; Lucas 1935: 196; Lewis 1987: 7.
(Fig. 12)
Plants green, sessile, c. 2-5 cm in diameter; sometimes spherical and often irregularly
lobed. Thallus hollow, the walls 1 cell thick, with angular or polygonal cells clearly seen
with the naked eye. Lightly attached to substratum via small rhizoids.
Distribution
Tropical oceans.
Fijian Records
Chapman 1971: 165 (as D. favulosa (C. Agardh) Decaisne); Kapraun and Bowden 1978;
Kasahara 1985: 34; 1988; South and Kasahara 1992: 48.
Rotuman Distribution
Common at all sites. Representative material: Hapmafau (L391 USP 418); Lopta (L331
USP 419, L401 USP 480).