1Department of Plant Anatomy, Eötvös University, Pázmány P. s. 1/C, Budapest, H-1117 Hungary
2“Plant Ecology” Research Group of the Hungarian Academy of Sciences, Szent István University, Páter K. u. 1., Gödöllő H-2103, Hungary
3Institute of Botany and Ecophysiology, Faculty of Agricultural and Environmental Sciences, Szent István University, Páter K. u. 1., Gödöllő H-2103, Hungary