1. Department of Biological Sciences University of Manitoba Winnipeg Manitoba R3T 2N2 Canada
2. Gantz Family Collections Center, Field Museum, 1400 S Lake Shore Drive Chicago IL 60605 USA
3. Department of Botany and Plant Pathology Oregon State University Corvallis OR 97331−2902 USA
4. Department of Environmental and Plant Biology 317 Porter Hall, Ohio University Athens OH 45701 USA