This is the propagule of Horsetail from an air sample collected during the month of April in Western Washington State.
Transmitted Oblique Off Circular Polarized Light Illumination
Equisetum spp., Field Horsetail, pollen ranges from 30 to 75 micrometers in diameter. It is spherical in shape but may
be folded. It often has four wing or strap-like elaters when fresh.
Significance in the Environment: