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Benthic Marine Algae of Rotuma Island 413
Habitat and Remarks
Epiphytic on Chondria dasyphylla, middle reef tidal pool. The genus Fosliella has been
transferred to the genus Hydrolithon Foslie 1909 by Penrose and Chamberlain (1993), based
on characteristics of the tetrasporangial conceptacles.
Jania Lamouroux 1812: 186
Key to the Rotuman Species of Janiu
1. Thallus not tufted or cushion-like, repent, to 10 mm high; angle of branching more than 45"
..................................................................... J. adhaerens
1: Thallus tufted and erect, forming dense cushions to 20 mm high; angle of branching 25-30" .......
........................................................................ J.rubens
Jania adhaerens Lamouroux 1816: 270 (type locality: 'MCditerrante?'); Taylor 1960:
413, pl. 49, figs 1, 2 ('adherens'); Chapman 1963: 86, fig. 85; Tsuda 1964: 10; Dawes 1974:
124; Jaasund 1976: 77, fig. 154; Woelkerling 1976: 132, figs 257-259; Tsuda and Wray
1977: 108; Ngan and Price 1979: 10; Cribb 1983: 47, pl. 10, figs 4,5; Lewis 1984: 14; Tseng
et al. 1984: 90, pl. 48, fig. 2; Payri and Meinesz 1985a: 513; Lewis and Norris 1987: 18;
Silva et al. 1987: 34; Littler et al. 1989: 204; Tsuda 1991: 54; Price and Scott 1992: 48, fig.
12A-C; South and Yen 1992: 129.
(Fig. 126)
Plants erect to repent, up to 10 mm high, branching at angles of more than 45". Branches
190-200 pm in diameter, the segments 3-5 diameters long with articulations at the base of
each branch and often between forkings. Apex of branches conical, roundish to acute. Plants
sterile.
Distribution
Fiji, Nauru, Micronesia, Tahiti; Australia, Taiwan, Philippines, Japan, China, Caribbean,
Tanzania.
Fijian Records
Garbary et al. 1991: 255; South and Kasahara 1992: 60.
Rotuman Distribution
Kelega (K2/ USP 559); Lopta (*L49/ USP S7: 15); common at most sites around the
island.
Habitat and Remarks
Epiphytic on larger algae or corals, or attached to rocks in tide pools and back reef sites.
Jania rubens (Linnaeus) Lamouroux 1816: 272, pl. 9, figs 6, 7; Setchell 1935: 228;
Taylor 1950: 133; 1960: 413, pl. 49, fig. 3; Chapman 1955: 356; 1963: 85, fig. 84;
Womersley and Bailey 1970: 314; Haritonidis and Tsekos 1976: 281; Tsuda and Wray 1977:
108; Lewis 1984: 15; Payri and Meinesz 1985~: 513; Silva et al. 1987: 35; Littler et al.
1989: 206; Yoshida et al. 1990: 291; Millar and Kraft 1993: 14.
Corallina rubens Linnaeus 1758: 806 (type locality: Europe).
- (Figs 125~4, 141)
Plants pink-red, tufted and erect, forming extended, tightly packed cushions up to 20 mm
high. Branching dichotomous, the angle narrow (less than 45", typically about 25-30")