Cosmarium scenedesmus
Image © Roland Luts


Cosmarium scenedesmus. Notice smooth-walled cell that is about as long as broad and semicells that are ellipsoid in outline.
Cell dimensions (L x B): 42 x 40 µm




 


Desmid of the Month
August 2024

Cosmarium scenedesmus*


C. scenedesmus is a medium-sized, smooth-walled Cosmarium. Cells are about as long as broad and semicells are ellipsoid in outline resulting in a cell sinus that is closed to about half-way. Also in apical view semicells are elliptic without any median protuberance. In the Netherlands, C. scenedesmus is of occasional occurrence in various mesotrophic water bodies.

*C. scenedesmus Delponte 1877 is better known under the name of C. depressum (Nägeli) Lundell 1871 which latter name, however, should be considered an illegitimate synonym.


Cosmarium scenedesmus
Image © Alfred van Geest

Another cell of C. scenedesmus in frontal view.

Cosmarium scenedesmus
Image © Alfred van Geest

Cell of C. scenedesmus in apical view. Notice elliptic outline.