1. Department of Earth & Environmental Sciences; University of Michigan; Ann Arbor MI 48109-1005 USA
2. Museum of Paleontology; University of Michigan; Ann Arbor MI 48109-1079 USA
3. Department of Earth Sciences; Royal Holloway; University of London; London TW20 0EX UK
4. Herbarium; Singapore Botanic Gardens; National Parks Board; Singapore 259569
5. Department of Plant and Microbial Biology & University and Jepson Herbaria; University of California; Berkeley CA 94720-2465 USA
6. Swiss Light Source; Paul Scherrer Institut; Villigen 5232 Switzerland
7. Advanced Photon Source; Argonne National Laboratories; Argonne IL 60439 USA
8. Advanced Light Source; Lawrence Berkeley National Laboratories; Berkeley CA 94720 USA