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Gamophyceae: Desmidales: Mesotaeniaceae
(Charophyceae: Zygnematales: Mesotaeniaceae)

 Netrium oblongum
(De Brary) Lütkemüller var. oblongum

Netrium oblongum Species [ var. oblongum ]: Cell body cylindrical ellipsoid, both ends broadly rounded; laminae of chloroplasts deeply dented showing circular depressions; 108-148 μm long, 27-39 μm wide, L/W=3-4.
[ var. cylindricum W. et G.S. West ]: Smaller than var. oblongum; 60-90 μm long, 17-25 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Netrium oblongum (De Brary) Lütkemüller var. oblongum cell body about 120 μm long, 34 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
Netrium oblongum Netrium oblongum Netrium oblongum Netrium oblongum
Cell body 164 μm long, 34 μm wide, x 640
Netrium oblongum Netrium oblongum Netrium oblongum Netrium oblongum

Netrium oblongum (De Brary) Lütkemüller var. oblongum cell body 127 μm long, 33 μm wide, x 640, Shijuhachi-ike (pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 1, 2006 by Y. Tsukii
Netrium digitus Netrium digitus
Cell body 158 μm long, 32.5 μm wide, x 640
Netrium oblongum Netrium oblongum Netrium oblongum

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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