1. Laboratory of Paleoecology, Institute of Botany of the Czech Academy of Sciences, Brno, Czech Republic
2. Department of Botany, Faculty of Sciences, Palacký University Olomouc, Olomouc, Czech Republic
3. Environmental Electron Microscopy Group, Institute of Scientific Instruments of the Czech Academy of Sciences, Brno, Czech Republic
4. Department of Vegetation Ecology, Institute of Botany of the Czech Academy of Sciences, Brno, Czech Republic