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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, cell body 67 μm long, 11 μm wide, L/W=6.1, x 640, No. 2, Iroha-numa (marsh/bog), Zao mountain, Yamagata city, Yamagata Pref., Japan, August 2, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Penium Penium
Cell body 40 μm long, 11 μm wide, L/W=3.6, x 640
Penium Penium
Cell body 54 μm long, 11 μm wide, L/W=4.9, x 640
Penium Penium

Images of collecting locality: No. 2, Iroha-numa (marsh/bog), Zao mountain, Yamagata city, Yamagata Pref., Japan, August 2, 2006 by Y. Tsukii

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