Genus: Spherical or ellipsoidal colony composed of 2-50 ovoid cells arranged radially;
cell body usually covered by short bristles; two chloroplasts lateral; no stigma;
longitudinal cell division; fresh water (Kudo, 1966).
Images of collecting locality:
Jizoh-bori at Sannoh Park, Nishi-ku, Saitama city, Saitama Pref., Japan, January 29, 2006 by Y. Tsukii