1. Jan Kochanowski University, Institute of Biology, Department of Botany, Świętokrzyska St. 15, PL-25-406 Kielce, Poland;(R. P.), (S. G.)
2. Agricultural University, Department of Pomology and Apiculture, 29 Listopada St. 54, PL-31-425 Kraków, Poland;(Ł. M.)