Paper birch, Betula papyrifera Family: Corylaceae Pollen Grain Morphology: Psilate, indistinctly tectate, triporate Pollen Grain Size: 24.7 + 1.0 µm by 22.6 + 0.9 µm April 14, 2015Corylaceae, UncategorizedBetula, Betula papyrifera, Corylaceae, Paper Birch, triporate