Potato pollen as viewed with confocal scanning laser microscopy showing three apertures in the pollen wall, a tube nucleus (opaque object in the center, and generative nucleus (brightly-fluorescing, oblong object below tube nucleus). The generative nucleus will divide mitotically to yield two sperm.

The confocal scanning laser microscopy images are presented as stereo pairs for viewing with a standard stereo viewer or map-reading device, or by relaxing and crossing your eyes until the right and left images fuse into one.

Reference: Braselton, J. P., M. J. Wilkinson, & S. A. Clulow. 1996. Feulgen staining of intact plant tissues for confocal microscopy. Biotech. & Histochem. 71: 84-87.