1. Negaunee Institute for Plant Conservation Science and Action, Chicago Botanic Garden, 1000 Lake Cook Road Glencoe IL 60022 USA
2. Instituto de Biologia, Universidade Federal da Bahia, Rua Barão de Jeremoabo, s.n., Ondina Salvador Bahia 40170‐115 Brazil
3. Earth Sciences, Negaunee Integrative Research Center, Field Museum of Natural History 1400 S Lake Shore Dr Chicago IL 60605 USA
4. Department of Paleobiology National Museum of Natural History, Smithsonian Institution Washington D.C. 20560 USA