1. Meise Botanic Garden, Nieuwelaan 38, B-1860 Meise (Belgium) filip.verloove@botanicgardenmeise.be
2. Herbarium, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AE (United Kingdom) janebrowning@btinternet.com
3. Directorate of Hortobágy National Park, Sumen u. 2, H-4024 Debrecen (Hungary) amesterhazy@gmail.com