8 
BULLETIN" 247, U. S. DEPAETMEXT OF AGRICULTURE. 
For a number of years Prof. E. Bethel has collected from the leaves 
of Ribes longifiorum at Denver, Boulder, and elsewhere in Colorado 
a species of Cronartium which is apparently not identical with the 
European Cronartium rioicola. 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 strdbus) 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 FECIAL FORM.* 
The gecial 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 pyri- 
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 Ccmandra; 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. 
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specimens cited except those marked with a star (*) have been examined by one of the writers. 
