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| Size | length: 28 - 30 um; width: 24 - 26 um | |
| Shape | triangular | |
| Exine | less than 1 um thick | |
| Intine | less than 20 um thick, thicker at narrow end than at wide | |
| Pores | 1 - 4, appear as thinnings of wall, one at broadened end and sometimes 3 obscured around periphery | |
| Sculpting | granular | |
| Bloom Period | spring and early summer | |
| Allergenicity | not considered to be an important allergy provoker |
Dr. M. Davis images:
References:
Bassett, John, Clifford Crompton and John Parmelee. An Atlas of Airborne Pollen Grains and Common Fungus Spores of Canada. Canada Department of Agriculture, 1978.
Jelks, Mary, M.D. Allergy Plants that Cause Sneezing and Wheezing. World Wide Printing, Tampa, 1986.
Kapp, Ronald O. Pollen and Spores, Second Edition. The American Association of Stratigraphic Palynologists Foundation, 2000.
Lewis, Walter H., Prathibha Vinay and Vincent E. Zenger. Airborne and Allergenic Pollen of North America. The Johns Hopkins University Press, Baltimore and London, 1983.
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