1. Department of Botany, National Museum of Natural History Smithsonian Institution Washington, DC 20013‐7012 USA
2. M.G. Kholodny Institute of Botany National Academy of Sciences Kiev 01601 Ukraine
3. Instituto Politécnico Nacional CIIDIR Unidad‐Durango‐COFAA, C.P Durango 34220 Mexico
4. Comparative Plant and Fungal Biology, Royal Botanic Gardens, Kew Richmond Surrey TW9 3AE UK