Species [ var. diplosporum ]: Cell body medium in size, cylindrical, slightly constricted at center, 52-66 μm long, 23-33 μm wide, L/W=2.0; semicells slightly-ellipsoidal cylindroid, apex broadly rounded; cell wall finely dotted, chloroplasts consisting of longitudinal axis and radially-arranged laminae. [ var. major ]: Larger than var. diplosporum, (98)-102-115 μm long, 43-47 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

31 μm 63 μm 94 μm; x 640