Which species is this pollen from?
Ulmus; e.g. U. glabra Quercus; e.g. Q. robur Tilia; e.g. T. cordata Corylus; e.g. C. avellana
Ulmus; e.g. U. glabra
Quercus; e.g. Q. robur
Tilia; e.g. T. cordata
Corylus; e.g. C. avellana
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