|  Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells   
(Illustrations of The Japanese Fresh-water Algae, 1977). Species:  
Trichome straight, without constriction at cell-cell junction, 15-20 μm wide; 
cell body short, 3-5 μm long, L/W=1/6-1/3; 
granules present along septum; terminal cells semielliptical, with thickened cell wall 
(Illustrations of the Japanese Fresh-water Algae, 1977).
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