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).
cell body 10-18 μm long, 5.5 μm wide,
x 640, Fukada Park, Sanda city, Hyogo Pref., Japan, November 2001 by Y. Tsukii
94 μm; x 640