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

 Mesotaenium caldariorum
(Lagerheim) Hansgirg 1886

Mesotaenium Genus: Cell body ellipsoidal or short cylindrical; chloroplasts plate-like.
Species: Cell body cylindrical, tapered toward both rounded ends, 20-50 μm long, 10-15 μm wide, L/W=2.5-4; chloroplast irregularly wavy, with 2 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977) .

Mesotaenium caldariorum (Lagerheim) Hansgirg ?, cell body 32 μm long, 10 μm wide, L/W=3.2, x 640, No. 2-3, Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, June 17, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Mesotaenium Mesotaenium

Images of collecting locality: No. 1, 2, Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, June 17, 2006 by Y. Tsukii

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