. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. BULLETIN OF THE No. 247 Contribution from the Bureau of Plant Industry, Win. A. Taylor, Chief. July 20, (PROFESSIONAL PAPER.) A DISEASE OF PINES CAUSED BY CRONARTIUM PYRIFORME. By George G-. Hedgcock, Pathologist, and William H. Long, Forest Pathologist, Investigations in Forest Pathology. CONTENTS. Page. History of the fungus 1 Morphology of the fungus 2 Synonymy and description of the fungus 3 Inoculation experiments with the fungus 5 Distribution of the fungus 8 Distributio
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. BULLETIN OF THE No. 247 Contribution from the Bureau of Plant Industry, Win. A. Taylor, Chief. July 20, (PROFESSIONAL PAPER.) A DISEASE OF PINES CAUSED BY CRONARTIUM PYRIFORME. By George G-. Hedgcock, Pathologist, and William H. Long, Forest Pathologist, Investigations in Forest Pathology. CONTENTS. Page. History of the fungus 1 Morphology of the fungus 2 Synonymy and description of the fungus 3 Inoculation experiments with the fungus 5 Distribution of the fungus 8 Distribution of the aecial form 8 Distribution of the uredinial and telial forms 9 Dissemination of the fungus 12 Effect of the fungus on its host plants 13 Effect of the aerial form on pines 13 Effect of the uredinial and telial forms on Comandra plants 16 Eradication and control of the fungus 16 Literature cited 20 HISTORY OF THE FUNGUS. In 1875 Peck (10.)1 described as a new species under the name Peri- dermiwn pyriforme a caulicolous or stem-inhabiting Peridermium with obovate to pyriform spores from a specimen collected by J. B. Ellis (No. 2040). In 1882 Ellis issued in his North American Fungi under No. 1021 a caulicolous Peridermium which he called uPeridermium pyriforme on small branches of Pinus virginiana" and in the Ellis Herbarium, now at the New York Botanical Garden is a specimen labeled uPeridermium pyriforme on small branches of Pinus rigida, Newfleld, New Jersey, May, ; Both of these latter specimens appear to be Peridermium comptoniae; at any rate, neither of them is the true P. pyriforme originally described by Peck. Arthur and Kern (1) in 1906 described as P. pyriforme Peck what is now known as P. comptoniae. In 1913 the writers received from Prof. E. Bethel a caulicolous species of Peridermium on Pinus contorta7 which they described as a 1 Reference is made by number to " Literature cited/-' p. 20. Note.—This bulletin discusses an important disea
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