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Fig. 5. Polysiphonia rhizoidea sp. nov. A, A vegetative branch. B, Branch showing a trichoblast. C, Basal 
segment of a thallus showing a multicellular rhizoid with a disklike tip. D, A multicellular rhizoid with a 
simple tip. E, Branch showing a young and a mature antheridium. F, Branch with six mature antheridia. G, 
Branch showing a mature cystocarp. H , Branch with tetraspores. 
