Sampling date 04/2007. Scale bar indicates 25 µm.

Synoptic representation of the cell wall (upper image part) and optical cross-section (lower images part).
The cell in the middle of the filament is about to divide. The cell is already elongated, the chloroplasts have separated and the nucleus has migrated to the middle of the cell. The usual position of the nucleus can be seen in the first and fourth cells from the right in the lower image of the cell filament.

Place name: Bog near Salzburg (Austria) 
Latitude: 48.068516     Longitude: 12.954134

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF image.