Genus: Planktonic; colony of 16, 32 or 64 cells, irregular in shape, without gelatinous sheath; colony consists of subsets of 4 cells connected by gelatinous filaments extending from the center; each subset consists of cells of two types, 2 cells located outward, kidney- or heart-shaped, other 2 cells located inward, cylidrical, both ends rounded; a single chloroplast plate-like in shape, slightly curved, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998). Species:

50 μm 100 μm 150 μm; x 400 : 31 μm 63 μm 94 μm; x 640

Dimorphococcus lunatus, Uruguay 1999, photo by Y. Tsukii

Dimorphococcus lunatus A. Braun: Colonies of 32-64 cells each connected with thin filament, two types of cells in shape, ellipsoid and heart-like, 10-15 μm long, 5-8 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).