1. Department of Biology, Centre for Ecological and Evolutionary Synthesis (CEES), University of Oslo, PO Box 1066 Blindern, NO-0316 Oslo, Norway
2. Department of Plant and Environmental Sciences, University of Gothenburg, PO Box 461, 405 30 Gothenburg, Sweden
3. Department of Botany & Zoology, Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic
4. Institute of Botany, Academy of Sciences of the Czech Republic, Lidická 25/27, CZ-657 20 Brno, Czech Republic
5. Department of Environmental and Plant Biology, Porter Hall, Ohio University, Athens, OH 45701, USA