Species: Trichome straight, but slightly curved at terminals, both ends rounded, 8.5-9 μm wide, L/W=0.3-1.0; septum not constricted, granules present along septum (Illustrations of The Japanese Fresh-water Algae, 1977).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: Toyonodai park (or Seseragi park), Toyonodai, Otone town, Saitama Pref., Japan, March 4, 2006 by Y. Tsukii