1. CONICET‐Museo Paleontologico Egidio Feruglio, Av. Fontana 140, Trelew, Chubut 9100, Argentina
2. Department of Biological Sciences, University of Alberta, Edmonton, Alberta AB T6G 2E9, Canada
3. Department of Botany and Plant Pathology, 2082 Cordley Hall, Oregon State University, Corvallis, Oregon 97331 USA
4. Department of Environmental and Plant Biology, Ohio University, Athens, Ohio 45701 USA