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 μm long, 9-11 μm wide, pyrenoids present,
x 400, x 640, Kanayama green park, Kiyose city, Tokyo, Japan, August 2001 by Y. Tsukii
150 μm; x 400