1. Department of Plant Cytology and Embryology; Jagiellonian University; Cracow Poland
2. Department of Plant Systematics; University of Silesia; Katowice Poland
3. Department of Vascular Plant Systematics and Phytogeography; W. Szafer Institute of Botany; Polish Academy of Sciences; Cracow Poland
4. Institute of Biology; Pedagogical University of Cracow; Cracow Poland
5. The Icelandic Institute of Natural History; Borgum viđ Norđurslóđ; Akureyri Iceland
6. Department of Botany; Charles University in Prague; Prague Czech Republic
7. Institute of Botany; Academy of Sciences; Průhonice Czech Republic