1. General Botany Laboratory, Adam Mickiewicz University, Faculty of Biology, Institute of Experimental Biology, Umultowska 89, Poznań, Poland
2. Polish Academy of Sciences, Institute of Dendrology, Parkowa 5, Kórnik, Poland
3. Aleksandras Stulginskis University, Faculty of Forest Science and Ecology, Studentų str. 11, Akademija, Kaunas reg., Lithuania
4. Department of Forest Resources, University of Minnesota, St Paul, MN, USA