132 
THE SEAWEEDS 
Granite Island, Victor Harbour; growing as isolated plants on granite 
rocks in spray zone, on the south side of the island. 
Britain, Europe. 
N emotion multifidum (Weber & Mohr 1804) J. Agardh has recently 
been recorded for New South Wales. (Linnean Society of N.S.W., 70, 
p. 121 (1946).) This species is distinguished by its dichotomously 
branched thallus, but as all gradations in branching, from simple to several 
times dichotomous, exist, separation of two species is doubtfully valid. 
If only one species is accepted, N. helminthoides takes priority over N. 
multifidum. 
HELMINTHOCLADIA J. Agardh. 
Frond terete, gelatinous, slimy, branching in all directions. A medul- 
lary axis of longitudinal threads; the periphery of vertical, dichotomous, 
moniliform, sub-free. Cystocarps as in Nemalion. Tetrasporangia not 
known. 
Helminth ocladia australis Harvey. 
Attached by a small disc, densely tufted, 10 cm. to 30 cm. high, and as 
much in the spread of the branches. A main stem serves as a percurrent axis 
Fig. 8 . — Helminthocladia australis: a, the plant; b. 
cross-section of a branch; c, partial 
longitudinal section, showing the arrange- 
ment of the axile threads, and those of 
the periphery. (After Harvey.) 
