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Photographic gallery.  Thousands of particles under the microscope.
Cirsium arvensis(Canada Thistle) Pollen Under the Microscope

Cirsium arvensis (Canada Thistle) Pollen

This pollen grain was from a Canada thistle flower in Eastern Washington State during August 2014. It has been dewaxed with alcohol but not acetalized. The mounting medium is Cargille Melt Mount 1.704 with a refractive index of 1.704. This is at high focus.

Transmitted Brightfield Illumination


KINGDOM: Plantae /Angiosperms /Eudicots /Rosids/Asterids ORDER: Asterales FAMILY: Asteraceae TRIBE: Cynareae GENUS: Cirsium SPECIES: arvense

Significance in the Environment:

Characteristic Features:

Associated Particles:


Faegri, Knut and Johs Iversen, TEXTBOOK OF POLLEN ANALYSIS, Hafner Publishing Company, 1964.

Kapp, Ronald O., HOW TO KNOW POLLEN AND SPORES, Wm. C. Brown Company, 1969.

Moore, P.D., J. A. Webb, and M. E. Collinson, POLLEN ANALYSIS, Blackwell Scientific Publications, 1991