354 
THE SEAWEEDS 
whose articulations are very short, the terminal cellules acute. Articula- 
tions of the branches oblong, nearly twice as long as broad. Tetrasporangia 
globose, near the ends of the ramuli, sessile. Colour red-brown. Substance 
firm, adheres closely to paper. 
Victoria (Warrnambool, Port Fairy), Tasmania. 
Fig. 176 . — Antithamnion dispar: a, plant; b, portion 
of a branch with its unequal ramuli, a 
long ramulus opposing an abortive one; 
c, ramellus bearing tetraspores; d, 
ramellus bearing antheridia. (After 
Harvey.) 
Antithamnion gradient urn (Harv.) J. Agarclh. 
= Callithamnion gracilentum Harvey. 
Frond dwarf, creeping, ramuli slender, free at the apices, oppositely 
pinnate ; pinnae distichous, almost regular, lower ones opposite, upper ones 
alternate ; the pinnellae arcuate, pinnulated, simple. 
West Australia (Rottnest Island). 
