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 tenuissima ?,
vegetative cells 11 μm long, 35 μm diam., with 1 chloroplast,
x 100, x 200, x 400, x 640, Yamagata Pref., Japan, 1999, by Y. Tsukii
150 μm; x 400