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Fig. 2. A, Polysiphonia howei, portion of a branch showing pericentral cells in offset positions, with 
two secondary pit connections with pericentral cells of adjacent segments; also showing the characteristically 
short basal cell of a trichoblast. B, Polysiphonia homoia, cystocarp (immature). C, Polysiphonia tsudana, 
tetrasporangial branch. D, Polysiphonia pentamera, apex of a branch, showing laterals and trichoblasts. 
