1. UA Museum of the North and Department of Biology and Wildlife; University of Alaska Fairbanks; 907 Yukon Dr., PO Box 756960 Fairbanks AK 99775-6960 USA
2. Department of Molecular and Cellular Biology; University of Guelph; Guelph ON Canada N1G 2W1
3. Department of Botany, MRC-166; Smithsonian Institution; PO Box 37012 Washington DC 20013-7012 USA