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Elm

Family, Genus: Ulmaceae, Ulmus

Size  34 - 40 um
Shape  oblate-spheroidal
Exine 2 um thick
Intine 1 - 1.6 um thick,
Pores 4 - 6 porate, usually 5, with onci
Sculpting  granulate
Bloom Period  March and April
Allergenicity  moderately allergenic

Thumbnails:
        
Elm                      Elm                        Elm                    Elm

Dr. M. Davis images:
Elm

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