Szukana fraza: [Opis = "This paper is a part of a Ph. D. Thesis carried out in Institute of Dendrology of the Polish Academy of Sciences in Kórnik under supervision of Dr F. Młodzianowski from the Department of Botany, A. Mickiewicz University in Poznań. This study was supported by research program MR II\/16, coordunated by Institute of Dendrology, Kórnik"]