Figs. 8-21. (Scale = 100m except as indicated.) 8, 9, Polysiphonia apiculata, vegetative branch tip. 
10, Polysiphonia sphaerocarpa var. filifera, branch tips with immature tetrasporangia. 11, Polysiphonia flac- 
cidissima, a delicate variant with branched trichoblasts associated with young branch. 12, Polysiphonia flac- 
cidissima var. decimera, showing branching pattern (from the type collection). 13, Polysiphonia hancockn, 
PACIFIC SCIENCE, Vol. XXII, January 1968 
