Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species (var. crasa):
Trichome straight or slightly curved, no constriction at cell-cell junction, 1.5-2 μm in diam.;
cell body about 4-10 times longer than its width; septum indisinguishable (provably near pseudovacuoles)
(Illustrations of the Japanese Fresh-water Algae, 1977).
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