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:
Axis-brach differentiation slightly conspicuous; apical cells hairly;
cell body cylindrical, slightly swelled at the center forming slight constriction at cell-cell junction;
axial cells 20-55 μm long, 10-15 μm in diam.,
branching cells 12-35 μm long, 8-12 μm in diam.;
a single chloroplast plate-like, with one or several pyrenoids
(Illustrations of The Japanese Fresh-water Algae, 1977).
|