Species: Cell body cylindrical or ellipsoidal, tapered to both ends, 35-79 μm long,
(16-21)-36 μm wide; both ends broadly rounded; cell wall thin, brownish in color,
finely lined (15-18/10 μ)
(Illustrations of The Japanese Fresh-water Algae, 1977).
Penium polymorphum Perty ?? or Cosmarium sp. ?,
cell body (right) 2 μm long, 26 μm wide, L/W=2.7,
x 640, No.2, Mizunashi-Yachi, Komado marsh (No.9), Showa village and Tajima town, Fukushima Pref., Japan, May 21, 2007, by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
No.2, Mizunashi-Yachi, Komado marsh (No.10), Showa village and Tajima town, Fukushima Pref., Japan, May 21, 2007, by Y. Tsukii