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. (or Klebsormidium ?),
cell body 7-13 μm long, 9-10 μm wide,
x 640, Oyomi marsh, Hakuba village, Nagano Pref., Japan, October 3, 2004 by Y. Tsukii
94 μm; x 640