Genus: Colonies of 4-32 cells; cell body long crescent or spindle in shape, tapered at both ends;
cells attached with each other at the center of the body, paralleled or radially arranged;
no gelatinous sheath; a chloroplast; no pyrenoids; planktonic
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species:
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