Subgenus: lacks arm-like projections
(Illustrations of The Japanese Fresh-water Algae, 1977)
Section [Raphidiastrum]:
Species: Cell body 23.7 μm long, 23.7 μm wide, isthums 10.8 μm wide,
8 short spines at each side of trianglur semicell in top view
(Illustrations of The Japanese Fresh-water Algae, 1977)
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