1. Institute of Botany Academy of Sciences of the Czech Republic 379 82 Třeboň Czech Republic
2. Swiss Federal Research Institute WSL Birmensdorf Zürcherstrasse 111 8903 Birmensdorf Switzerland
3. Institute of Botany Academy of Science of the Czech Republic CZ‐252 43 Průhonice Czech Republic
4. Department of Botany Faculty of Science Charles University Benátská 2 128 01 Praha 2 Czech Republic