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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 μm long, μm wide, L/W=, x 640, standing water on a bank under Kurome-gawa-bashi (bridge), Kurome River, Hizaori-cho, Asaka city, Saitama Pref., April 20, 2008, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Mesotaenium caldariorum Mesotaenium caldariorum Mesotaenium caldariorum Mesotaenium caldariorum Mesotaenium caldariorum

Images of collecting locality: Standing water on a bank under Kurome-gawa-bashi (bridge), Kurome River, Hizaori-cho, Asaka city, Saitama Pref., April 20, 2008, by Y. Tsukii

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