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Gamophyceae: Zygnematales: Desmidiaceae
(Chlorophyceae: Zygnematales: Gonatozygaceae or Mesotaeniaceae)

 Mesotaenium macrococcum
(Kützing) Roy et Bisset

Mesotaenium Genus: Cell body ellipsoidal or short cylindrical; chloroplasts plate-like.
Species: Cell body cylindrical, 22-38 μm long, 11-20 μm wide, both ends rounded, a single plate-like chloroplast present, margins dented (Illustrations of The Japanese Fresh-water Algae, 1977) .

Mesotaenium macrococcum (Kützing) Roy et Bisset, cell body 28.5 μm long, 14 μm wide, L/W=2.0, x 640, a small marsh pond near memorial pole of Saito Mokichi (close to Iroha-numa), Zao mountain, Yamagata city, Yamagata Pref., Japan, August 2, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Mesotaenium Mesotaenium Mesotaenium

Images of collecting locality: a small marsh pond near memorial pole of Saito Mokichi (close to Iroha-numa), Zao mountain, Yamagata city, Yamagata Pref., Japan, August 2, 2006 by Y. Tsukii

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