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).
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