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 (Illustrations of The Japanese Fresh-water Algae, 1977).
cell body μm long, 10.5 μm wide, L/W=,
x 640, Hakkoda Gourd line, Hakkoda mountain, Aomori city, Aomori Pref., Japan, July 17, 2005 by Y. Tsukii
31 μm 63 μm 94 μm; x 640