Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
Oscillatoria ?
2.5 x 12 μm
L/W=0.2
Shimizu-daira
Nasu
Tochigi, 2005
Oscillatoria ?
2.5 x 11 μm
L/W=
Hakkoda Gourd line
Hakkoda mountain
Aomori, 2005
