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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium diplosporum
(Lundell) Lütkemüller
= Actinotaenium diplosporum (Lundell) Teiling 1954

Cosmarium diplosporum Species [ var. diplosporum ]: Cell body medium in size, cylindrical, slightly constricted at center, 52-66 μm long, 23-33 μm wide, L/W=2.0; semicells slightly-ellipsoidal cylindroid, apex broadly rounded; cell wall finely dotted, chloroplasts consisting of longitudinal axis and radially-arranged laminae.
[ var. major ]: Larger than var. diplosporum, (98)-102-115 μm long, 43-47 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium diplosporum, cell body 46 μm long, 27 μm wide, L/W=1.7, isthmus 24 μm wide, x 400, x 640, standing water, Nakayukawa-sen (a forestry road along Omatazawa), Nishiwaga town, Iwate Pref., Japan, May 4, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium diplosporum Cosmarium diplosporum

Images of collecting locality: No.3, standing water, Nakayukawa-sen (a forestry road along Omatazawa), Nishiwaga town, Iwate Pref., Japan, May 4, 2007 by Y. Tsukii

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