1. Institute for Botany and Botanical Garden, Faculty of Biology, University of Belgrade, Belgrade, Serbia
2. Institute for Botany and Botanical Garden, Faculty of Biology, University of Belgrade, Belgrade, Serbia + Department of Botany, Institute of Biology and Ecology, Faculty of Science, Pavol Jozef Šafárik University in Košice, Košice, Slovakia
3. Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, Sofia, Bulgaria
4. Department of Forest Ecology, Slovenian Forestry Institute, Ljubljana, Slovenia
5. Department of Biology, Medical University Varna, Varna, Bulgaria
6. Department of Botany, Hungarian Natural History Museum, Budapest, Hungary
7. Department of Environmental Protection, International University of Brčko, Brčko, Bosnia and Herzegovina, Brčko, Bosnia and Herzegovina
8. Institute of Forestry, Belgrade, Serbia
9. Department of Biology, Faculty of Sciences, University of Priština in Kosovska Mitrovica, Serbia
10. Natural History Museum, Belgrade, Serbia
11. Institute of Biology - Bucharest, Romanian Academy, Splaiul Independentei, Bucharest, Romania
12. Institute of Biology, Pedagogical University of Cracow, Kraków, Poland
13. Department of Botany, Institute of Biology and Ecology, Faculty of Science, Pavol Jozef Šafárik University in Košice, Košice, Slovakia