1. Faculty of Biology, National and Kapodistrian University of Athens, Department of Ecology and Systematics, Athens, Greece
2. Nicolaus Copernicus University, Institute for the Study, Conservation and Restoration of Cultural Heritage, Toruń, Poland
3. Faculty of Biology, National and Kapodistrian University of Athens, Department of Botany, Athens, Greece
4. European Commission, Joint Research Centre (JRC), Ispra, Italy