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 5-10 μm long, 7 μm wide, pyrenoids present,
x 640, Fukada Park, Sanda city, Hyogo Pref., Japan, November 2001 by Y. Tsukii
94 μm; x 640