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Black Walnut
Family, Genus: Juglandaceae, Juglans nigra
| Size | 31 - 68 um | |
| Shape | spheroidal | |
| Exine | less than 3 um thick | |
| Intine | .5 - 3 um thick, thickened under apertures forming an oncus | |
| Pores | polyporate, located on equator and distal face (not proximal) | |
| Sculpting | scabrate | |
| Bloom Period | May and June, or earlier depending on latitude and elevation | |
| Allergenicity | moderately allergenic |
Thumbnails:
Black Walnut Black Walnut Black Walnut Black Walnut
Dr. M. Davis images:
Black Walnut
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