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Fossil Castaneoideae pollen from the Eocene of West Greenland. a, d, g, and j LM micrographs. b, c, e, f, h, i, k, and l SEM micrographs. All pollen grains are shown in equatorial view. a–l Castaneoideae sp. 3. Scale bar is 10 µm in a, d, g, and j, and 1 µm in b, c, e, f, h, i, k, and l
