542 PACIFIC SCIENCE, VoL XXII, October 1968 
Fig. 2. A, Herposiphonia pacifica, tip of determinate branch, with spermatangial stichidia. B, Herposi- 
phonia pacifica, tip of determinate branch, with trichoblasts. C, Herposiphonia parca , tip of determinate branch, 
bearing a spermatangial stichidium. D, Herposiphonia filifera, tip of young determinate branch, with young 
trichoblasts. E, Herposiphonia nuda, tip of determinate branch, with young and mature spermatangial stichidia. 
F, Herposiphonia nuda, tip of determinate branch. G, Herposiphonia variabilis, tip of determinate branch, with 
young cystocarp. H. Herposiphonia delicatula, tip of multicellular rhizoid seen in end view. 
