1. Department of Botany and Biodiversity Research University of Vienna Vienna Austria
2. Department of Systematic and Evolutionary Botany University of Zurich Zurich Switzerland
3. Missouri Botanical Garden St. Louis MO USA
4. Roy M. Huffington Department of Earth Sciences Southern Methodist University Dallas TX USA
5. Departments of Botany and Geology & Geophysics University of Wyoming Laramie WY USA
6. Department of Paleontology University of Vienna Vienna Austria