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Chlorophyceae: Chlorococcales: Dictyosphaeriaceae

 Dimorphococcus lunatus
A. Braun

Dimorphococcus 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:

Dimorphococcus sp. (lunatus ?), cell body 22 μm long, 7 μm wide, x 400, x 640, Vermont-Maine U.S.A., August 7-13, 1999, by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Dimorphococcus Dimorphococcus

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).

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