1. Nees Institute for Biodiversity of Plants University of Bonn Bonn Germany
2. Institute of Botany The Czech Academy of Sciences Průhonice Czech Republic
3. Department of Botany Faculty of Science Charles University Prague Czech Republic
4. Meise Botanic Garden Meise Belgium
5. Department of Biology Institute of Botany and Microbiology KU Leuven Leuven Belgium
6. Natural History Museum London UK
7. Institut für Integrierte Naturwissenschaften – Biologie Universität Koblenz‐Landau Koblenz Germany