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Polysiphonia of the Tropical Pacific, I — Hollenberg 
Fig. 3. A, Polysiphonia poko, prostrate branch and bases of erect branches. B, Polysiphonia poko, un- 
named var., with young cystocarps and very delicate trichoblasts. C, Polysiphonia pseudovillum, apex of erect 
branch. D, Polysiphonia tuherosa, branch apex. E, Polysiphonia tuberosa, branch apex with delayed exoge- 
nous origin of a lateral in association with a trichoblast. 
