Genus: Colony of 4, 8 or 16 cells, within a gelatinous sheath, which is spherical or ellipsoidal in shape;
cell body broad crescent in shape, both ends rounded;
a single chloroplast plate-like in shape, with a pyrenoid
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Colonies of 2-4 cells, embedded within a gelatinous sheath; cell body crescent in shape, 10-16 μm long, 4-8 μm wide; a single chloroplast plate-like, with a pyrenoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Images of collecting locality:
No.11, Kannon-numa Forest Park (pond/marsh), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii