1. Department of Biology and Ecology; Faculty of Sciences and Mathematics; University of Niš; Višegradska 33 18000 Niš Serbia
2. Department of Chemistry; Faculty of Sciences and Mathematics; University of Niš; Višegradska 33 18000 Niš Serbia
3. Institute of Forestry; Kneza Višeslava 3 11000 Belgrade Serbia
4. Institute of Botany and Botanical Garden “Jevremovac”; Faculty of Biology; University of Belgrade; Studentski trg 16 11000 Belgrade Serbia