Reasting cyst of a green with and a desmid. indicates 50 µm.
Sample from the wetland at Schweizeralm near Waidring (Tyrol, Austria). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Wolfgang Bettighofer, www.protisten.de.