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

Penium spirostriolatum
Barker

Penium spirostriolatum Species: Cell body cylindrical, large in size, slightly constricted at the center, bands present, 77-325 μm long, 15-30 μm wide, L/W=5-10; cell wall brownish, striated (striae slighlty slanted) (Illustrations of The Japanese Fresh-water Algae, 1977).

Penium spirostriolatum Barker var. spirostriolatum, cell body 173 μm long, 23 μm wide, L/W=7.5, x 640, No.2, Ko-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Penium spirostriolatum Penium spirostriolatum Penium spirostriolatum
Cell body 142 μm long, 24 μm wide, L/W=5.9, x 640
Penium spirostriolatum Penium spirostriolatum

Images of collecting locality: No.2, Ko-numa (pond/marsh), Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii

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