Species ldentification of Ulmus Pollen

Abstract

On the basis of pore counts on modern pollen it is shown that Ulmus glabra Huds., U. laevis Pall., V. minor Mill. (U. carpinifolia G. Suchow) and U. procera Salisb. can be distinguished with some degree of certainty by their pollen. On the basis of fossil pollen it is shown that Ulmus laevis was the first elm species to immigrate into Lithuania, as has been asserted earlier, and that Ulmus glabra dominated the elm population in Atlantic time at the Danish localities investigated.