Genus: Cell body cylindroid, both ends rounded; cell wall smooth or granulated or longitudinally lined;
constriction or bands present in some species; outer cell wall yellowish or brownish;
chloroplast has radially-arranged laminae which attached cell wall in full length;
one or several pyrenoids in each semicell, aligned in chloroplasts
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
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