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Benthic Marine Algae of Rotuma Island
Fijian Record
New record for Fiji.
Rotuman Distribution
Lopta (L37lUSP 476).
Habitat and Remarks
Found as compact, entangled mats on the outer reef flat and reef rim, highly exposed to
wave action and closely associated with Turbinaria ornata, Hypnea sp., and Chnoospora
minima. Rotuman plants are noticeably shorter and thinner than Harvey's original decription
for this species. The difference may be due to the high degree of exposure the Rotuman
plants are faced with.
Chondria simpliciuscula Weber-van Bosse 1913: 125, pl. 12, figs 9-10 (type locality
unknown); Tsuda and Wray 1977: 105; Price and Scott 1992: 169, fig. 59A-E.
(Figs 130, 133, 190a, b)
Plants reddish-brown, up to 3 mm high and 135-188 pm in diameter. Thallus terete and
creeping, up to 17 mm long and attached to the substratum via groups of rhizoids projecting
from the ventral surface of prostrate axis. Single, erect lateral fertile branchlets broadened
apically, most bearing tetrasporangia 47-82 pm in diameter. Apical cell in a shallow pit, up
to 7 p,m high, undergoing transverse division below and surrounded by a small tuft of
trichoblasts forming a characteristic apical crown up to 30 pm high. Cortical cells of main
axes polygonal to isodiametric near the apices, elongate longitudinally and polygonal to
ellipsoidal in mature sections, 6-8 p,m in diameter and 8-15 p,m long.
Distribution
Fiji, Micronesia, Australia, Indonesia.
Fijian Record
New record for Fiji.
Rotuman Distribution
Hapmafau ("HAP151 USP S5: 15).
Habitat and Remarks
Found within Valonia aegagropila algal mat on exposed beach rock; back reef.
Herposiphonia Nageli 1846: 238
Herposiphonia secunda (C. Agardh) Ambronn f. tenella (C. Agardh) Wynne 1985a: 173;
Trono 1969: 85; Lewis 1984: 55; Payri and Meinesz 1985a: 512; Silva et al. 1987: 64; Price
and Scott 1992: 175, fig. 62A-D; Millar and Kraft 1993: 53; Verheij and Prud'homme van
Reine 1993: 173; Wynne 1993: 16.
Hutchinsia tenella C. Agardh 1828: 105 (type locality: Sicily sensu Silva et al. 1987: 64).
Herposiphonia tenella (C. Agardh) Ambronn 1880: 197; Okamura 1930(1929-1932): 23,
pl. 264, figs 1-9; Taylor 1950: 147; 1960: 604, pl. 72, fig. 12; Dawson 1954: 452, fig. 59a;
1956: 29; 1957: 124; Durairatnam 1961: 71, pl. 28, figs 4-6; Chapman 1963: 127, fig. 133
(as H. tenella (C. Agardh) Naegeli); Hollenberg 1968c: 555, fig. 14; Dawes 1974: 158;
Jaasund 1976: 129, fig. 261; Woelkerling 1976: 130, figs 241-244; Tsuda and Wray 1977:
107; Cribb 1983: 112, pl. 68, fig. 1 (f. secunda); Santelices and Abbott 1987: 9; Abbott
1989: 230; South and Yen 1992: 129.