Desmid of the month
mouse-over image © Alfred van Geest
Filament of Desmidium aptogonum. Notice the large cavities in between adjacent cells.
Cell dimensions (L x B): 18 x 32 µm
The filamentous species Desmidium aptogonum
much resembles D. swartzii
. Like in D. swartzii
, cells in frontal view are distinctly broader than long and triangular in top view. D. aptogonum
mainly differs from D. swartzii
by the remarkably large cavities in between adjacent cells. Moreover, cell breadth to length ratio usually is somewhat lower than in D. swartzii
and the lateral sides of the semicell are more rounded. In the Netherlands D. aptogonum
is of occasional occurrence, particularly in slightly acidic to pH-neutral peat pits and fen hollows.
Image © Koos Meesters
Another filament of Desmidium aptogonum showing radiating chloroplast lobes.
Image © Jan Šťastný
SEM image of D. aptogonum.