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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 43 μm long, 17.5 μm wide, x 640, Shijuhachi-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 1, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Mesotaenium Mesotaenium Mesotaenium Mesotaenium
Cell body 32 μm long, 13 μm wide, x 640
Mesotaenium
Cell body 23 μm long, 14 μm wide, x 640
Mesotaenium Mesotaenium
Cell body 23 μm long, 13 μm wide, x 640
Mesotaenium Mesotaenium Mesotaenium

Mesotaenium macrococcum (Kützing) Roy et Bisset ?, cell body 25 μm long, 12.5 μm wide, x 640, Shijuhachi-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 1, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Mesotaenium
Cell body 27 μm long, 14 μm wide, x 640
Mesotaenium Mesotaenium
Cell body 33 μm long, 13.5 μm wide, x 640
Mesotaenium Mesotaenium

Images of collecting locality: No. 5, Shijuhachi-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 1, 2006 by Y. Tsukii

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