Section: Radiatiformes (Apexes of semicells with projections; arm-like projections smooth)
(Illustrations of The Japanese Fresh-water Algae, 1977) .
Species:
Cell body small 22-28 μm long (excluging arm-like projections)
(cf. S. leptacanthum 36-56 μm long)
(Illustrations of The Japanese Fresh-water Algae, 1977) .
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