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Ash
Family, Genus: Oleaceae, Fraxinus
| Size | 26 by 28 - 33 um in diameter | |
| Shape | prolate or suboblate to spheroidal | |
| Exine | 1 - 5 um thick | |
| Intine | .5 - 1.2 um thick, much thicker below apertures | |
| Furrows | 3 - 4 (-6) colpate, colpi long and narrow | |
| Sculpting | reticulate | |
| Bloom Period | March - May | |
| Allergenicity | Considered major offender in MInnesota (Spring Pollinosis), but in general, Ash do not elicit severe responses |
Thumbnails:
Dr. M. Davis images:
Green Ash White Ash
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.
page created by: Brian Hoffman