1. Institute of Botany, Plant Science and Biodiversity Centre, Slovak Academy of Sciences, Bratislava, Slovakia
2. Institute of Nature Conservation, Polish Academy of Sciences, Krakow, Poland
3. Institute of Biological Research, Cluj-Napoca, Romania
4. M.G. Kholodny Institute of Botany, National Academy of Sciences of Ukraine, Kyiv, Ukraine
5. Yuriy Fedkovych Chernivtsi National University, Chernivtsi, Ukraine