1. Department of Plant Biology; University of Minnesota; St. Paul MN 55108 USA
2. Department of Plant Pathology; University of Florida; Gainesville FL 32611-0680 USA
3. Department of Biology; Duke University; Durham NC 27708 USA
4. Farlow Herbarium of Cryptogamic Botany; Harvard University; Cambridge MA 02143 USA
5. Kunming Institute of Botany; Chinese Academy of Sciences; Kunming 650204 China
6. Instituto Tecnológico de Cd. Victoria; Tamaulipas 87010 Mexico
7. University of Sheffield; Sheffield UK
8. Department of Forest Ecosystems and Society; Oregon State University; Corvalis 97331-2106 OR USA