Cobb, F. W. 1988. Leptographium wageneri, cause of black-stain root disease: a review of its discovery, occurrence and biology with emphasis on pinyon and ponderosa pine. Pages 41-62 in T C. Harrington and F W Cobb, Jr. (eds.), Leptographium root diseases on conifers. American Phytopathological Society Press, St. Paul, Minnesota.