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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 62 μm long, 34 μm wide, L/W=, x 640, No. 3, Miyatoko marsh, Minami-Aizu town, Fukushima Pref., Japan, June 15, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium pseudopyramidatum Cosmarium pseudopyramidatum Cosmarium pseudopyramidatum Cosmarium pseudopyramidatum Cosmarium pseudopyramidatum


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