|  Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells   
(Illustrations of The Japanese Fresh-water Algae, 1977). Species: 
Trichome straight, with a constriction at cell-cell junction, 1.5 μm in diam.; 
cell body elongated, 4-12 μm long, L/W=2.5-8 
(Illustrations of The Japanese Fresh-water Algae, 1977).
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