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

Penium rufescens
Cleve
= Actinotaenium rufescens (Cleve) Teiling

Penium cylindrus Species: Cell body cylindrical, medium in size, both ends broadly rounded, (56-65)-80 μm long, 20-31 μm wide, L/W=2-2.5; cell wall thick, densely dotted, transparent or brownish in color (Illustrations of The Japanese Fresh-water Algae, 1977).

Penium rufescens Cleve, cell body 67 μm long, 24 μm wide, L/W=2.8, narrowed toward the center (22 μm wide), x 640, No.6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Penium substriatum Penium substriatum Penium substriatum Penium substriatum

Images of collecting locality: No.6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii

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