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)13–20 µm, B. (9)12– 18 µm. Coesel 1991. |
Cosmarium contractum Kirchn.
Dimensions: L. 30–50 µm, B. 20–30 µm. Lenzenweger 1999. Krieger
& Gerloff 1962. |
Cosmarium depressum (Näg.) Lund. f. minutum Heimerl.
Dimensions: L. 14–18 µm, B. 18–21 µm. Lenzenweger 1999.
Gelatinous rods secreted through the cell wall are visible on
the picture. |
Cosmarium sp. cf. kirchneri Börges. C. margaritiferum v. kirchneri)
Dimensions: L. 50–75 µm, B. 44–60 µm. Coesel 1991, Lenzenweger
1999. |
Cosmarium subcucumis Schmidle
Dimensions: L. 40–80 µm, B. 30–50 µm. Coesel 1991, Lenzenweger
1999. |
|
|
