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420 A. D. R. N'Yeurt<br />
branching at intervals of 3-12 mm. Ultimate segments broadly rounded, lobed, consisting of<br />
a medulla 220-225 pm thick composed of 4 or 5 layers of cells up to 115 pm in diameter<br />
grading into a cortex of 1 or 2 layers of pigmented angular cells c. 5 X 13 ym. Outer<br />
medullary cells of lower portions of thallus filled with floridean starch grains 47-60 Fm in<br />
diameter. Tetraspores 25-32 pm in diameter, scattered below the cortex within the outer<br />
medulla.<br />
Distribution<br />
Fiji, Caroline Islands, Mexico.<br />
Fijian Record<br />
New record for Fiji.<br />
Rotuman Distribution<br />
Maka Bay (MAK71 <strong>USP</strong> 352, MAK81 <strong>USP</strong> 353).<br />
Habitat and Remarks<br />
Growing beneath tabular pavona coral on the outer-middle reef where it forms clumps up<br />
to 15 cm in diameter.<br />
Ceramiales<br />
Ceramiaceae<br />
Centroceras Kiitzing 184 1 : 73 1<br />
Key to the Rotuman Species of Centroceras<br />
1. Apices apiculate ....................................................... .C. apiculatunz<br />
1: Apices incurved-forcipate ............................................... .C. clavulaturn<br />
Centroceras apiculatum Yamada 1944: 42; Dawson 1956: 55, fig. 55; Cribb 1983: 75,<br />
pl. 26, fig. 1, pl. 57, figs 1,2; Price and Scott 1992: 79, fig. 24A-D; Wynne 1993: 12, fig. 6.<br />
(Figs 148-151, 163)<br />
Thalli up to 2.5 mm high and 117-140 pm in diameter, epiphytic via translucent rhizoids<br />
23-30 pm in diameter projecting from ventral surface of prostrate axes. Branching mostly<br />
simple, with apices apiculate, non-forcipate, terminating in a large apical cell 10-1 1 pm long<br />
which undergoes transverse division and from the basal part of which gradually flat, disc-<br />
shaped segments are cut off. Axial cells ovoid, 50-54 Fm in diameter. Thalli fully<br />
corticated; cortications in distinct pattern of horizontally-disposed subrectangular pericentral<br />
cells 7-15 pm in diameter at nodal points, and vertically-disposed, elongated ovoid cells<br />
14-20 pm between nodes. Internodal distances (between pit-connections of axial cells)<br />
4548 pm. Tetrasporangia cruciate, 30-35 pm in diameter, arranged in pairs in stichidia-like<br />
clavate branchlets up to 42 pm long and 20 pm broad.<br />
Distribution<br />
Fiji, Micronesia, northern Australia, Maldives.<br />
Fijian Records<br />
Garbary et al. 1991: 254; South et al. 1993: 188.<br />
Rotuman Distribution<br />
Hapmafau ("HAP571 <strong>USP</strong> S4: 10, *HAP581 <strong>USP</strong> S4: 11, *HAP591 <strong>USP</strong> S4: 12).