Genus: A single trichome within a rigid sheath; sheath clear or yellowish; filaments planktonic or
agglutinated (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body 4-5 μm long, 2 μm wide, L/W=2-2.5
(Illustrations of The Japanese Fresh-water Algae, 1977).
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