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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium pseudopyramidatum
Lundell

Cosmarium pseudopyramidatum Species [var. pseudopyramidatum]: Cell body medium in size, 42-61 μm long, 25-41 μm wide, L/W=1.8, isthmus 12.5-14 μm wide; semicells pyramidal or semielliptical in shape with flattened apex, basal corners rounded, lateral margins convex; a single chloroplast in each semicell.
[var. stenonotum Nordstedt f. minor Raciborski]: Cell body small, 28-42 μm long, 24-25 μm wide, isthmus 10-11 μm wide.
[var. carniolicum Lütkemüller]: Cell body 46-59 μm long, 29-34 μm wide, L/W=1.5, isthmus 12.6-14 μm wide; lateral margins concave (Illustrations of The Japanese Fresh-water Algae, 1977).


Cosmarium pseudopyramidatum Lundell var. pseudopyramidatum, cell body 55 μm long, 33 μm wide, isthmus 14 μm wide, x 640, Omine-numa (pond/marsh), Tsukiyono town, Gunma Pref., Japan, September 2003 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium pseudopyramidatum Cosmarium pseudopyramidatum Cosmarium pseudopyramidatum
Cosmarium pseudopyramidatum Cosmarium pseudopyramidatum
Cosmarium pseudopyramidatum Cosmarium pseudopyramidatum

Cosmarium pseudopyramidatum Lundell var. pseudopyramidatum, cell body 53 μm long, 29 μm wide, isthmus 14 μm wide, x 640, Omine-numa (pond/marsh), Tsukiyono town, Gunma Pref., Japan, September 2003 by Y. Tsukii
Cosmarium pseudopyramidatum Cosmarium pseudopyramidatum Cosmarium pseudopyramidatum


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