PollyMapElm pollen photographed through the microscope in the PollyKit lab — verified in Arizona.
About elm pollen
Early-season tree pollen with five equatorial pores and a rippled wall.
Plants that produce it
- Siberian and Chinese elm
- American and slippery elm
- Naturalized elm
How to recognize it
Squat circular grain, about five pores, wall with low wavy ridges.
Typical published size: 25–40 µm
Commonly confused with
- Hackberry — fewer pores
- Oak — furrows instead of pores
Allergy relevance
Moderately allergenic and among the earliest tree pollens each year.
Where it's found
PollyMap has verified specimens of Elm from Arizona.
Most of the United States.
Also searched as: elm pollen, ulmus pollen, siberian elm pollen.
Related pollen specimens
Citing this specimen: PollyMap Specimen Library. “Elm — verified microscope specimen.” pollymap.com/library/specimen/elm-pollen-arizona-f9bf97
Expert discussion
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