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). Species: Cells 16-60 μm (usually 40-50 μm) in diam., 3.5-7 μm long (Photomicrographs of the Freshwater Algae, vol. 4, 1985).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: Kamogawa Daiichi Choseichi (water reservoir), near Mihashi Park, Saitama city (Omiya), Saitama Pref., Japan, July 30, 2006 by Y. Tsukii