Birch Pollen
Transmitted Oblique Off Circular Polarized Light Illumination

Betula spp., Paper Birch, pollen is about 27 to 30 micrometers in diameter. It is triporate with a pore cavity formed
by a separtation between the endexine and ektexine. The surface of the grain is psilate. Birch is a prolific producer of pollen.