Genus: Trichome without mucous sheath; straight, long, consisting of numerous cells
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
Oscillatoria sp. (or Phormidium retzii (Agardh) Gomont ?),
cell body 6-11 μm long, 7.5 μm wide, L/W=0.8-1.5,
x 640, a small pond near Shin-Akitsu railway station, Higashi-Murayama city, Tokyo, Japan, February 11, 2004 by Y. Tsukii
31 μm
63 μm
94 μm; x 640