This green balls are often seen in sphagnum ponds. Looking through the stereomicroscope this group of specimen looked photogenic. The picture was generated from 5 shots using MicroPicS by Bernhard Wiedemann and Photoshop (depth of focus).
Sample from sphagnum pond Dosenmoor near Neumuenster (Schleswig-Holstein, Germany). This image was taken using Zeiss Universal with Olympus C7070 CCD camera.
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Wolfgang Bettighofer, www.protisten.de.