Cells are curved, associated in loose colonies
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Cells are small, each containing a single chloroplast; although may associate into colonies, these are not mucilaginous.
Selenastrum -
Long, spindle-shaped cells tapering to sharp points, weakly to strongly curved, row of pyrenoids absent; may cluster together in bundles.
Ankistrodesmus -
Cells small, usually associated in small colonies surrounded by mucilage (if found singly, difficult to distinguish from Selenastrum).
Kirchneriella