Family: Chloroplasts plate-like or ribbon-like; sexual reproduction by isogamy.
Genus: Without gelatinous sheath; filaments consist of many cells; rhizoid formed at one end
(Illustrations of The Japanese Fresh-water Algae, 1977).
Similar Genus ->> Klebsormidium Ulothrix sp. ?,
cell body 5-18 μm long, 35-40 μm wide,
x 640, Usui river, near Yachiyo bridge, Takasaki city, Gunma Pref., Japan, April 11, 2004 by Y. Tsukii
150 μm; x 400