1. University of Zurich, Department of Systematic and Evolutionary Botany, Zollikerstrasse 107, CH-8008 Zürich, Switzerland
2. Roseggergasse 12, A-8741 Weisskirchen, Austria
3. University of South Bohemia, Faculty of Science, Department of Botany, Branišovská 1760, 370 05 České Budějovice, Czech Republic