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Desmid of the month
December 2007
Cylindrocystis gracilis
Like in Cylindrocystis brebissonii cells of Cylindrocystis gracilis are
cylindric in shape with broadly rounded ends. However, whereas the chloroplasts
in C. brebissonii are provided with ridges that, from a central core,
radiate in all directions, the chloroplast ridges in C. gracilis run
more or less parallel in a longitudinal direction. Cylndrocystis gracilis was described by Ilse Hirn (1953). As an additional diagnostic characteristic
(against C. brebissonii) she found a different stainability of cell sap
when treated with specific dyes. In the Netherlands C. gracilis is
locally of abundant occurrence in (semi)emersed Sphagnum vegetation.
Reference
Hirn, I., 1953.
Vitalfärbungsstudien an Desmidiaceen. — Flora 140: 453-473. |
Image © RIZA (mouseover)
Cell
of Cylindrocystis gracilis (in different focus). Notice the longitudinal
chloroplast ridges.
Cell
dimensions (L x B): 40 x 13 µm.
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