Family: Trichome (filamentous structure) lacks heterocysts; with equal diameter throughout whole length; no hair-like structure; no branching. Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells Species: Tricome dark green, straight or slightly curved, without constriction, not attenuated toward ends, 2-3 μm long, 5.5-7.5 μm wide; both ends broadly rounded (Illustrations of The Japanese Fresh-water Algae, 1977).

31 μm 63 μm 94 μm; x 640