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Gamophyceae: Desmidales: Desmidaceae or Peniaceae
(Charophyceae: Zygnematales: Desmidaceae)

Penium polymorphum
Perty

Penium polymorphum 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 49 μm long, 22 μm wide, L/W=2.2, x 640, Watasuge marsh (or bog), Tsugaike highland (Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Penium Penium Penium

Penium polymorphum Perty, cell body 50 μm long, 20 μm wide, L/W=2.5, isthmus 17.5 μm wide, x 640, Watasuge marsh (or bog), Tsugaike highland (Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Penium Penium
Cell body 62.5 μm long, 21.5 μm wide, L/W=2.9, isthmus 21 μm wide, L/W=, x 640
Penium Penium Penium

Images of collecting locality: Watasuge marsh (or bog), Tsugaike highland (Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii

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