1. Department of Ecology; Faculty of Science; Charles University; Viničná 7 2 128 44 Prague Czechia
2. Department of Systematics, Biodiversity and Evolution of Plants (with Herbarium); Georg-August-University of Göttingen; Untere Karspüle 2 37073 Göttingen Germany
3. Institute of Botany; The Czech Academy of Sciences; Dukelská 135 379 82 Třeboň Czechia
4. Centre for Polar Ecology; University of South Bohemia; Na Zlaté stoce 3 370 05 České Budějovice Czechia