Species: Cell body moderately curved, gradually attenuated toward ends, which are broadly rounded,
inner margin slightly inflated in the middle, outer margin strongly convex,
204-384 μm long, 36-60 μm wide, L/W=4.6-8;
chloroplasts with 4-6 longitudinal ridges and 4-7 pyrenoids in each semicell;
cell wall smooth and colorless; zygospores ellipsoid with a smooth wall
(Photomicrographs of the Freshwater Algae, vol. 7, 1987).
Cell body 170-450 μm long, 28-72 μm wide, L/W=6-8
(Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> C. ehrenbergii;
Images of collecting locality:
Oyomi marsh, Hakuba village, Nagano Pref., Japan, May 8, 2006 by Y. Tsukii