Genus:
Cell body flat, large, variable in shape, longer than wide; strong constriction at center;
each semicell with several notches; cell wall with many short spines
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
|
50 μm
100 μm
150 μm; x 400
31 μm
63 μm
94 μm; x 640