1. Farlow Herbarium and Department of Organismic and Evolutionary Biology, Harvard University, 22 Divinity Avenue, Cambridge, MA 02138, USA;
2. Department of Plant Pathology, University of California at Davis, One Shields Avenue, Davis, CA 95616, USA;
3. Department of Plant Pathology and Microbiology, University of California at Riverside, 900 University Avenue, Riverside, CA 92521, USA;
4. Department of Fish and Wildlife, University of Idaho, Moscow, ID 83844‐1141, USA