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,
cell body 70 μm long, 32 μm wide,
x 640, Shijuhachi-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 1, 2006 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Cell body 62 μm long, 25 μm wide, x 640
Cell body 68 μm long, 27 μm wide, x 640
Cell body 69 μm long, 31 μm wide, x 640
Cell body 52 μm long, 24 μm wide, x 640
Images of collecting locality:
No. 5, Shijuhachi-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 1, 2006 by Y. Tsukii