1. University of Chicago, Committee on Evolutionary Biology Culver Hall, Rm. 402, 1025 E. 57th St., Chicago, IL, 60637, USA
2. Field Museum of Natural History, Botany Department 1400 S. Lake Shore Drive, Chicago, IL, 60605, USA
3. School of Animal and Microbial Sciences University of Reading Whiteknights, Reading, RG6 6AJ, UK
4. Sir Harold Mitchell Building, School of Biology, University of St Andrews St Andrews, Fife, KY16 9TH, UK