Polyad
Polyad: Pollen consisting of more than one grain.
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Faegri, Knut and Johs Iversen, TEXTBOOK OF POLLEN ANALYSIS, Hafner Publishing Company, 1964.
Kapp, Ronald O., HOW TO KNOW POLLEN AND SPORES, Wm. C. Brown Company, 1969.
Moore, P.D., J. A. Webb, and M. E. Collinson, POLLEN ANALYSIS, Blackwell Scientific Publications, 1991
Smith, E. Grant, SAMPLING AND IDENTIFYING ALLERGENIC POLLENS AND MOLDS, Blewstone Press, San Antonio, Texas, 1990
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