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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 or Netrium ?, cell body 55 μm long, 18 μm wide, L/W=3.1, x 640, a small wetland near Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, May 15, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Penium Penium
Cell body 54 μm long, 18 μm wide, L/W=, x 640
Penium Penium
Cell body 70 μm long, 20 μm wide, L/W=, x 640
Penium Penium Penium

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