Vogler, D. R., Bruns, T. D., Cobb, F. W., Jr., Geils, B., Nelson, D. L., and Popenuck, T. L. 1992.
Department of Plant Pathology, University of California,
Berkeley, CA 94720, and
U.S.D.A., Forest Service, Rocky Mtn. and Intermtn. Research Stations, Fort Collins, CO 80526, and Provo, UT 84606.
Newsletter of the Mycological Society of America 43(1-3):53. (1992)
Phylogenetic relationships among selected pine [stem] rust fungi [Cronartium and Peridermium species] native to North America were studied using isozyme analysis, and by sequencing the internal transcribed spacer (ITS) region. Isozyme banding patterns confirm traditional relationships among some western U.S. pine rust fungi, but reveal new relationships among others; e.g., white-spored gall rust infecting Pinus ponderosa in Colorado and Nevada may be a new species separate from Peridermium harknessii and more closely related to P. bethelii; P. stalactiforme appears to comprise two distinct forms that infect Pinus contorta and P. jeffreyi, respectively. Sequence analysis generally supports isozyme results, and indicates that P. harknessii is more closely related to Cronartium quercuum f. sp. banksianae and other pine-oak rusts than to the C. coleosporioides group.