. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 8 BULLETIN" 247, IT. S. DEPARTMENT OF AGRICULTURE. For a number of years Prof. E. Bethel has collected from the leaves of Ribes longiflorum at Denver, Boulder, and elsewhere in Colorado a species of Cronartium which is apparently not identical with the European Cronartium ribicola. The senior writer collected abundant specimens of the uredinial and telial forms of this rust both at Boulder and Denver, Colo., in October, 1914. The telia of this Cronartium are larger, more abundan
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 8 BULLETIN" 247, IT. S. DEPARTMENT OF AGRICULTURE. For a number of years Prof. E. Bethel has collected from the leaves of Ribes longiflorum at Denver, Boulder, and elsewhere in Colorado a species of Cronartium which is apparently not identical with the European Cronartium ribicola. The senior writer collected abundant specimens of the uredinial and telial forms of this rust both at Boulder and Denver, Colo., in October, 1914. The telia of this Cronartium are larger, more abundant, and much more conspicuous than those of the European species. Although the fungus has been epidemic for several years on the Chautauqua grounds near Boulder, two young white pines (Pinus strobus) on the grounds not far from the diseased Ribes were free from the disease. This species apparently is able to winter over on Ribes plants in the uredinial form. It may yet be found that the secial form is a Peridermium on one of our native pines. DISTRIBUTION OF THE FUNGUS. DISTRIBUTION OF THE ^CIAL FORM; The secial form of the fungus, Peridermium pyriforme, is widely distributed in the United States, having been found in 10 States:. Fig. 1.—Outline sketch map of the United States, showing the known distribution of Cronartium pijri- forme. Localities where collections of the different forms of the fungus have been made are indicated as follows: v, iEcial form on species of pines; *•, uredinial and telial forms on species of Comandra; X, all forms. Arizona, California, Colorado, Montana, New Jersey, Pennsylvania, South Dakota, Washington, Wisconsin, and Wyoming (fig. 1); and when a more careful search is made for the fungus, in the light of our present knowledge, it will no doubt be found to have a much more general distribution in this country. It has also been found in Alberta and British Columbia. 1 All specimens cited except those marked with a star (*) have been examined by
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