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

Penium cylindrus
(Ehrenberg) Brébisson var. cylindrus

Penium cylindrus Species [ var. cylindrus ]: Cell body cylindrical, both ends truncated with rounded corners, (48-56)-58 μm long, 8-(11-13)-21 μm wide, L/W=5.0; cell wall dotted, brownish in color when aged, bands present.
[ var. cuticulare ]: Smaller than var. cylindrus, 19-34 μm long, 8-10 μm wide, L/W=3; (Illustrations of The Japanese Fresh-water Algae, 1977).

Penium cylindrus (Ehrenberg) Brébisson var. cylindrus (or var. cuticulare (W. et G.S. West) Krieger ?), cell body 75 μm long, 8 μm wide, L/W=9.4, x 640, Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, September 24, 2008 collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Penium cylindrus Penium cylindrus

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