1. Department of Carpology, Institute of Environmental Biology, Faculty of Natural Sciences , Kazimierz Wielki University , Chodkiewicza 30, 85-093 Bydgoszcz , Poland
2. Biological Department, Faculty of Sciences Education , Omsk State Pedagogical University , Nab. Tukhachevskogo 14, 644009 Omsk , Russian Federation
3. Department of Botany and Genetics, Institute of Biology and Environmental Protection, Faculty of Mathematics and Natural Sciences , Pomeranian University , Arciszewskiego 22, 76-218 Słupsk , Poland