1. Institute of Botany, Institute of Botany of the Czech Academy of Science Průhonice Czech Republic
2. Faculty of Science, University of South Bohemia České Budějovice Czech Republic
3. Department of Biological Sciences, Faculty of Mathematics and Natural Sciences, University of Bergen Norway
4. Botany Department, State Museum of Natural History Stuttgart Stuttgart Germany
5. Institute of Ecology and Earth Sciences, University of Tartu Tartu Estonia
6. University of Life Sciences, Faculty of Forestry and Wood Sciences Prague Czech Republic