Birch pollen
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Pollen from silver birch (Betula pendula, Betulaceae). Birch pollen is a very common cause of tree-pollen hayfever - possibly second only to oaks. Technical description of Betula pendula pollen, from PalDat (Halbritter & Diethart, 2016): small isopolar monads, spheroidal or irregular, circular or irregular in polar view, triporate with annuli, and with a psilate, rugulate or microechinate exine. This model is part of the 3D Pollen Project. For more information, including how to download this file, see https://3dpollenproject.wixsite.com/main/downloads
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