1. Department of Botany and Zoology Faculty of Science Masaryk University Brno Czech Republic
2. Laboratory of Paleoecology Institute of Botany The Czech Academy of Sciences Brno Czech Republic
3. Institute of Botany, Plant Science and Biodiversity Center Slovak Academy of Sciences Bratislava Slovakia
4. Department of Plant Ecology and Environmental Conservation Faculty of Biology Biological and Chemical Research Centre University of Warsaw Warsaw Poland