1. Komarov Botanical Institute of Russian Academy of Sciences, Prof. Popov str., 2, St. Petersburg, 197376 Russia
2. Moscow State University, Faculty of Biology, Vorobovy Gory 1-12, Moscow, 119234 Russia
3. University of South Bohemia, Faculty of Science, Branišovská 31, CZ – 370 05 České Budějovice