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Hazel Catkins

Male catkins of hazel (Corylus avellana).

I took the following specimen back home with me:

This yielded the following pollen (magnification x600, field width 86um):

This and other photos I took show two distinct sizes of pollen grain. The larger ones are about 31 x 28um and the smaller about 24 x 21um.  I am not sure why there are two sizes.

First photo and specimen taken in Whiteknights Park, Reading, UK, on 2014-01-11.

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