Genus: Filamentous algae, axis-branch differentiation incomplete; terminal cells tapered to form spiny projections;
branches do not form in tuft
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Branching not so frequent; secondary branching rare; branching axial cells shorter compared to
non-branching cells; axial cells up to 8-12-(15) μm in diam., L/W=2-4;
constriction present at cell junction
(Illustration of the Japanese fresh-water algae, 1977).
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