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3. Plants to 5 mm high; apices forcipate with sparse dichotomous branching; cortical band smooth at
the edges, not curving upwards . . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . . . . . C. zacae
3: Plants to 10 mm high; apices strongly circinate with dense and repeatedly dichotomous branching,
cortical band bulging outwards at the edges and curving upwards . . . . . . . . . . . . . . C. mazatlanense
Ceramium codii (Richards) Mazoyer 1938: 324; Taylor 1960: 526; Jaasund 1970b: 68,
fig. IF, N, Dawes 1974: 145; Jaasund 1976: 107, fig. 216; Cribb 1983: 80, pl. 27, figs 1 4;
Lewis 1984: 41; Millar 1990: 393, figs 41D-F; 43B; Yoshida et al. 1990: 300; Price and
Scott 1992: 86, fig. 26A-D; Millar and Kraft 1993: 38.
Ceramothamnion codii Richards 1901 : 264, pls 21, 22 (type locality: Bermuda).
Ceramothamnion adriaticum Schiller 19 1 1 : 90.
Ceramium serpens sensu Dawson 19626: 64, pl. 25, fig. 6 (vide Millar 1990: 393).
(Figs 155a, b, 166)
Plants epiphytic, bright red-maroon, up to 600 pm high and 29-47 pm in diameter.
Branching straight, with rarely bifurcate tips and narrow cortical band. Axial cells elongate
and slender, cylindrical, 51-54 pm long. Nodal cortical band 10-13 pm long, composed of
one ring of larger, transversely elongate periaxial cells and 1 or 2 rings of irregularly
arranged smaller cells. Acropetal and basipetal cortical cells single-layered, triangular to
polygonal in surface view.
Distribution
Fiji, Australia, Japan, Caribbean, tropical Americas, Tanzania.
Fijian Record
New record for Fiji.
Roturnan Distribution
Hof6a (*H226/ USP S4: 14).
Habitat and Remarks
Epiphytic on Heterosiphonia subsecundata, the latter epiphytic on Melanamansia
glomerata within tidal pools in middie reef.
Ceramium mazatlanense Dawson 1950: 130, pl. 2, figs 14, 15 (type locality: Mazatlan,
Sinaloa, Mexico); Dawson 1954: 448, fig. 55g-j; 1956: 53; 1957: 122; 1962: 59, pl. 23, figs
1, 2; Womersley and Bailey 1970: 324; Jaasund 1970b: 67, fig. 1A; 1976: 107, fig. 215;
Tsuda and Wray 1977: 104; Ngan and Price 1979: 14; Lewis 1984: 42; Silva et al. 1987: 55;
Abbott 1989: 230; Tsuda 1991: 49; South and Yen 1992: 129.
(Figs 156, 157, 165)
Thalli up to 10 mm high and 190 ym in diameter, arising from a creeping axis
200-250 pm in diameter attached to the substratum via hyaline rhizoids projecting from
ventral nodal surfaces. Branching dense and repeatedly dichotomous, with strongly circinate
apices. Cortication extensive, with narrow internodes 32-37 pm in middle of erect branches,
becoming noticeably shorter (6-1 1 pm) towards the apex. Cortical bands 50-55 pm broad,
bulging outward at the edges and curving upwards. Axial cells subglobular, 72-77 pm in
diameter, from which arise a row of 6-8 periaxial cells giving rise to 2-3 rows of acropetally
directed apical cells 5-10 pm in diameter, and a few basipetally directed irregularly disposed
and angular axial cells 10-12 pm in diameter. Cystocarps 200-240 p.m in diameter, borne at
dichotomies on branch apices. Carposporangia 25-35 pm in diameter.