1Department of Biodiversity and Plant Cover Protection, University of Wrocław, Kanonia 6/8, 50-137 Wrocław, Poland
2Department of Geobotany and Plant Ecology, University of Łódź, Banacha 12/16, 90-237 Łódź, Poland
Pol. J. Environ. Stud. 2010;19(2):351–362