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

Penium sp.

Penium cylindrus Genus: Cell body cylindroid, both ends rounded; cell wall smooth or granulated or longitudinally lined; constriction or bands present in some species; outer cell wall yellowish or brownish; chloroplast has radially-arranged laminae which attached cell wall in full length; one or several pyrenoids in each semicell, aligned in chloroplasts (Illustrations of The Japanese Fresh-water Algae, 1977).

Penium sp. ?, cell body μm long, μm wide, x 640, Kuroiso Park, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, August 2003 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Penium Penium

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