Polysiphonia of the Tropical Pacific, I — Hollenberg 
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Fig. 4. A , Polysiphonia ruhrorhiza , showing saccate pigmented rhizoids arising from the base of erect 
branch, and from prostrate branches. From the type collection. B, Polysiphonia ruhrorhiza, immature cysto- 
carp (from type collection). C, Polysiphonia saccorhiza, prostrate branch with erect branch and saccate 
pigmented rhizoids. D, Polysiphonia saccorhiza, tetrasporic erect branch. 
