1 Institute of Biology, University of Leipzig, Department of Plant Physiology, Johannisallee 21-23, D-04103 Leipzig, Germany; German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, D-04103 Leipzig, Germany. Electronic address: cwilhelm@rz.uni-leipzig.de.
2 German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, D-04103 Leipzig, Germany; Institute of Biology, University of Leipzig, Department of Systematic Botany and Functional Biodiversity, Johannisallee 21-23, D-04103 Leipzig, Germany.