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).

31 μm 63 μm 94 μm; x 640