Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species (var. tenuis): Trichome straight, blue-green in color, with slight constriction at cell-cell junction, 4-10 μm wide; granules absent along septum; cell body 2.5-5 μm long, L/W=1/3; terminal cells semicircular (Illustrations of the Japanese Fresh-water Algae, 1977).
Oscillatoria sp.7
5 μm φ
Japan, 199?
Oscillatoria sp.7
3 μm φ
Umi-no-nakamichi
Fukuoka, 2001
