Cosmarium Corda ex Ralfs
One of the most species rich desmid genera with >1200 species.
It lacks distinctive features similar to those defining other
genera and it is often based on negative characters. Some basic
characters: end view often compressed, absence of spines, apex
of cell neither cleft nor indented, cells solitary. (Croasdale,
H. & Flint, E. 1988. Flora of New Zealand Desmids II. - Caxton
Press, Christchurch.) |
Cosmarium blyttii Wille
Dimensions: L. (10)1320 µm, B. (9)12 18 µm. Coesel 1991. |
![](images/Image03_06.jpg)
Cosmarium contractum Kirchn.
Dimensions: L. 3050 µm, B. 2030 µm. Lenzenweger 1999. Krieger
& Gerloff 1962. |
![](images/Image03_07.jpg)
Cosmarium depressum (Näg.) Lund. f. minutum Heimerl.
Dimensions: L. 1418 µm, B. 1821 µm. Lenzenweger 1999.
Gelatinous rods secreted through the cell wall are visible on
the picture. |
![](images/Image03_08.jpg)
Cosmarium sp. cf. kirchneri Börges. C. margaritiferum v. kirchneri)
Dimensions: L. 5075 µm, B. 4460 µm. Coesel 1991, Lenzenweger
1999. |
![](images/Image03_09.jpg)
Cosmarium subcucumis Schmidle
Dimensions: L. 4080 µm, B. 3050 µm. Coesel 1991, Lenzenweger
1999. |
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