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Ulvophyceae: Ulotrichales: Ulotrichaceae

 Geminella sp.

Geminella Genus: Filamentous algae without branching, no rhizoids, covered with gelatinous sheath; cell body cylindrical or ellipsoidal, cells attached side by side or separated; a single chloroplast band-form, with a pyrenoid (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species:

Geminella or Klebsormidium ???, cell body 6-11 μm long, 8 μm wide, L/W=0.8-1.4, gelatinous sheath about 1.5 μm in thickness, x 640, Iroha-numa (marsh), Zao mountain, Yamagata city, Yamagata Pref., Japan, July 9, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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