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Benthic Marine Algae of Rotuma Island 397
Acetabularia moebii Solms-Laubach 1895: 30, pl. 4 fig. 1 (type locality: Mauritius);
Borgesen 1951: 6, figs 1, 2; Egerod 1952: 411, fig. 23i; Dawson 1954: 397, fig. 13j; 1956:
43; 1957: 110; Tsuda 1964: 4 ('mobii'); Trono 1968: 192; Tsuda and Wray 1977: 93; Payri
and Meinesz 1985a: 506; Trono 1986: 243, fig. 48 ('mobii'); Lewis 1987: 37; Abbott 1989:
226 ('mobii').
Acetabularia minutissima Okamura 19 l2(1909-1912): 184 pl. 100, figs 7-1 1 (sensu
Valet 1969: 622).
Acetabularia polyphysoides Okamura (non Crouan) 1913: 21 (sensu Valet 1969: 622).
Acetabularia wettsteinii Schussnig 1930: 338; J., and G. Feldmann 1947: 81, figs 1, 2
(sensu Valet 1969: 622).
(Fig. 89)
Plants up to 6 mm high, with a monoplanar reproductive disc 2.5-3 mm in diameter,
borne atop a slender stalk. Disc composed of 14 cylindrically clavate segments with rounded
apices, the segments loosely joined together by light calcification. Corona superior present,
corona inferior lacking.
Distribution
Fiji, Micronesia, Tuvalu, Solomon Islands, Tahiti, northern Australia, Philippines, Japan,
China.
Fijian Records
Garbary et al. 1991: 252 (as Acetabularia moebii Solms-Laubach).
Rotuman Distribution
Hapmafau ("HAP521 USP S6: 13).
Habitat and Remarks
Found attached to coral debris in the lagoon, in association with Meristotheca
procumbens P. Gabrielson et Kraft. This species was transferred to the genus Polyphysa by
Schnetter and Bula-Meyer (1982: 42). The main distinguishing features between
Acetabularia (Lamouroux 18 12: 185) and Polyphysa are the lateral unison of gametangial
rays and the presence of an inferior corona in Acetabularia, and mostly free or loosely united
gametangial rays and the absence of an inferior corona in Polyphysa (Womersley 1984: 295).
The Rotuman plants agree with the latter description.
Phaeophyceae
Ectocarpales
Ectocarpaceae
Hincksia J.E. Gray 1864
Hincksia breviarticulata (J. Agardh) P.C. Silva in Silva et al. 1987: 73; Abbott 1989:
226; Wynne 1993: 19.
Ectocarpus breviarticulatus J. Agardh 1847: 7 (type locality: 'St. Augustin' (Oaxaca,
Mexico)); Dickie 1874; Borgesen 1914: 173, fig. 136; Setchell 1924: 171, fig. 37; Yamada
and Tanaka 1938: 66; Dawson 1954: 398, fig. 14a, b; 1956: 43; 1957: 110; Taylor 1960:
201; Durairatnam 1961: 32, pl. 6, figs 10, 11; Chapman 1963: 9, fig. 3; Kuckuck 1963: 362,
figs 1-3; Trono 1969: 25; Womersley and Bailey 1970: 288; Tsuda 1972: 90, pl. 1, fig. 1; pl.
2, fig. 1; 1976: 328; Chapman 1977: 162; Tsuda and Wray 1977: 101; Reyes 1980: 119, pl.
1, fig. 2a, b; Lu and Tseng 1984: 168, pl. 85, fig. 1; Lewis 1985: 3; Payri and Meinesz