Genus: Unicells; cell body spherical in shape; cell wall warty or wrinkled (Illustrations of The Japanese Fresh-water Algae, 1977). Cell wall with warts or a network of ridges or lines (Dillard, Common Freshwater Algae of the United States, J. Cramer 1999). Species: Cell body spherical, 8-26 μm in diam.; cell wall covered with reticulated ridges (Introduction to the Freshwater Algae, 1999).

31 μm 63 μm 94 μm; x 640