Desmid of the month
to Desmidium swartzii (desmid of the month of August 2003) cells
of Desmidium grevillei * in top view are not triangular (triradiate)
but ellipsoid (so biradiate) in shape. As we have to do with a species
in which the cells are united to form twisting filaments, series of cells
are alternatingly faced in relatively broad frontal view and in relatively
narrow lateral view (and transitional phases in between) resulting into
a filament with a seemingly varying diameter.
In the Netherlands D. grevillei is a rare species, confined to acidic, oligotrophic
* Synonym: Desmidium cylindricum
© Henk Schulp
of Desmidium grevillei displaying both cells in frontal and
in lateral view.
of a single cell in frontal view (L x B): ca 25 x 50 µm