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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium libellula
Focke var. libellula
= Closterium closterioides (Ralfs) Louis & Peeters

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Closterium libellula Species [var. libellula]: Similar to C. navucula (not curved, spindle or boat in shape) but large; 170-(216-224)-450 μm long, 30-(42-48)-52 μm wide; L/W = 5-8; chloroplast with 8-12 ridges; 3-5 pyrenoids in each semicell.
[ var. intermedium ]: Smaller than var. libellula; 75-(123-174) μm long, 15-(20-32)-36 μm wide; 3-4 pyrenoids in each semicell.
[var. interruptum]: Smaller than var. libellula, 90-(150-271)-400 μm long, 16-(25-31)-55 μm wide; chloroplast in each semicell separated into two pieces (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium libellula Focke var. libellula (or Closterium closterioides var. intermedium ?), cell body 244 μm long, 38 μm wide, L/W = 6.4, bands present, x 400, x 640, Vermont-Maine U.S.A., August 7-13, 1999, by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium libellula Closterium libellula Closterium libellula Closterium libellula
Closterium libellula Closterium libellula

* Closterium libellula Focke var. interruptum (W. et G.S. West) Donat:

C. navicula (Brébisson) Lütkemüller: Cell body not curved spindle or boat in shape; 24-(35-84)-93 μm long, 8-(11-20)-22 μm wide; L/W = 3-4; a single chloroplast and 1 or 2 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

C. libellula Focke var. libellula: Similar to C. navucula (not curved, spindle or boat in shape) but large; 170-(216-224)-450 μm long, 30-(42-48)-52 μm wide; L/W = 5-8; chloroplast with 8-12 ridges; 3-5 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

C. libellula var. intermedium (Roy et Bisset) G. S. West: Smaller than var. libellula; 75-(123-174) μm long, 15-(20-32)-36 μm wide; 3-4 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

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