1. Department of Plant and Environmental Sciences; University of Copenhagen; Thorvaldsensvej 40 1871 Frederiksberg C Denmark
2. Natural History Museum of Denmark; University of Copenhagen; Sølvgade 83, Entrance S 1307 Copenhagen K Denmark
3. Department of Plant Systematics & Geography; Institute of Botany; University of Warsaw; Aleje Ujazdowskie 4 PL-00-478 Warszawa Poland