1. Center for Forest Mycology Research, Forest Products Laboratory USDA, Forest Service, Madison, Wisconsin 53705
2. Department of Plant Pathology, New York State Agricultural Experiment Station, Cornell University, Geneva, New York 14456
3. Department of Plant Pathology, University of Nebraska, Lincoln, Nebraska 68583
4. State University of New York, College of Environmental Science and Forestry, School of Biology, Chemistry, and Forestry, Syracuse, New York 13210