1. Laboratory of Systematics and Geography; Institute of Dendrology; Polish Academy of Sciences; Kórnik Poland
2. Department of Botany; Poznań University of Life Sciences; Poznań Poland
3. General Botany Laboratory; Institute of Experimental Biology; Department of Biology; Adam Mickiewicz University; Poznań Poland
4. Department of Forest Resources; University of Minnesota; St. Paul MN USA
5. Hawkesbury Institute for the Environment; Western Sydney University; Penrith NSW Australia
6. Institute of Botany; Consejo Superior de Investigaciones Científicas; IBB-CSIC-ICUB; Barcelona Spain