Genus: Filamentous algae, axis-branch differentiation incomplete; terminal cells tapered to form spiny projections;
branches do not form in tuft
(Illustrations of The Japanese Fresh-water Algae, 1977).
cell body μm long, μm wide,
x 400, x 640, Omiya, Saitama city, Saitama Pref., Japan, April 2001 by Y. Tsukii
94 μm; x 640