358 
THE SEAWEEDS 
Fig. 178. — Lasiothallia plumigera : a, plant; b, section 
through the spongy frond, showing the 
central filament and its surrounding acces- 
sories, with the peripheric hairs; c, some of 
the hairs; d, a pair of plumules; e, one of 
their pinnules, with tetraspores. (After 
Harvey.) 
