Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Trichome straight or wavy, not constricted at cell-cell junctions, 2-3.5 μm long,
8-9 μm wide, L/W=1/4-1/3 (0.25-0.33); granules present along septum;
terminal cells rounded as calyptra (Illustrations of The Japanese Fresh-water Algae, 1977).
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