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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 25 μm long, 12 μm wide, L/W=2.1, x 640, Kamino-tanbo (bog/marsh), Tsugaike highland (near Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Mesotaenium Mesotaenium

Images of collecting locality: Kamino-tanbo (bog/marsh), Tsugaike highland (near Tsugaike Natural Park), Otari village, Nagano Pref., Japan, August 11, 2006 by Y. Tsukii

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