544 
PACIFIC SCIENCE, VoL XXII, October 1968 
Figs. 3-11. (Scale = I50p,) 
3. Herposiphonia delicatula, with procarps. 
4. Herposiphonia pacifica. Tip of determinate branch, with spermatangial stichidia. 
5. Herposiphonia arcuata. Apical portion of free part of indeterminate branch, with determinate and indeter- 
minate branches. 
6. Herposiphonia parca var. interrupta. Terminal portion of an indeterminate branch. 
7. Herposiphonia dendroidea var. minor. Terminal portion of an indeterminate branch. 
8. Herposiphonia nuda. Terminal portion of an indeterminate branch, with determinate branches. 
9. Herposiphonia dendroidea, showing densely branched trichoblasts on the determinate branches. 
10. Herposiphonia filifera. Terminal portion of a young determinate branch, with numerous short segments 
and immature trichoblasts. 
11. Herposiphonia suhdisticha, showing rudimentary trichoblasts at the apex of one or two determinate 
branches on the left. 
