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Fig. 3. Polysiphonia mollis Hook. & Harv. A, Segment of a basal thallus showing a simple and a digitate- 
tipped rhizoid. B, A vegetative branch showing young trichoblasts. C, A vegetative branch. D, E, Branches 
showing young antheridial clusters. F, Branch showing the spiral arrangement of tetraspores. G, Branch 
showing a mature cystocarp. 
