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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 60 μm long, 23 μm wide, L/W=2.6, x 640, a small marsh near prefectural road route 342, Sukawa highland, Kurikoma mountain, Higashi-naruse village, Akita Pref., Japan, June 24, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Penium polymorphum Penium polymorphum Penium polymorphum

Images of collecting locality: a small marsh near prefectural road route 342, Sukawa highland, Kurikoma mountain, Higashi-naruse village, Akita Pref., Japan, June 24, 2007 by Y. Tsukii

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