1. School of Archaeological Sciences, University of Bradford, Bradford BD7 1DP, UK.
2. Environmental Science, Saint Mary's University, Halifax, NS, B3H 3C3, Canada.
3. Canadian Museum of Nature, PO Box 3443 Stn “D”, Ottawa, ON, K1P 6P4, Canada.
4. Institute of Systematic Botany, The New York Botanical Garden, Bronx, NY 10458-5126.
5. Comparative Plant and Fungal Biology, Royal Botanical Gardens, Kew, Richmond, Surrey, UK.