Species:
Trichome straight, without constriction at cell-cell junction, 8-9 μm wide;
cell body short, 2-4 μm long, L/W=1/4-1/2; granules absent along septum;
terminal cells semicircular (Illustrations of the Japanese Fresh-water Algae, 1977).
Oscillatoria,
cell body 3 μm long, 8.5 μm wide, L/W=0.4,
x 640, Senjo-ga-hara (marsh), Nikko city, Tochigi Pref., Japan, September 2003 by Y. Tsukii
31 μm
63 μm
94 μm; x 640