. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. B^.stonia, on the American Weymouth pine, Pinus strobus L. This pine species is readily and severely attacked; the fungus spreads together with this host. Aecia are found in Europe in gardens on the American pine species, P. monticola , and P. lambertiana Dougl. In Japan the aecia are found on P. pentaphylla Mayr (= P. parviflora S. et Z.); in North America, on P. strobus in the east, and on P. monticola in the west. The Siberian cedar pine, Pinus sibirica Mayr (P. cembra L. var. sibirica Rupr.) represents the ini
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. B^.stonia, on the American Weymouth pine, Pinus strobus L. This pine species is readily and severely attacked; the fungus spreads together with this host. Aecia are found in Europe in gardens on the American pine species, P. monticola , and P. lambertiana Dougl. In Japan the aecia are found on P. pentaphylla Mayr (= P. parviflora S. et Z.); in North America, on P. strobus in the east, and on P. monticola in the west. The Siberian cedar pine, Pinus sibirica Mayr (P. cembra L. var. sibirica Rupr.) represents the initial host of the aecial stage, and possibly also P. cembra L. On the latter the fungus was first found in the Swiss Alps, in 1903. All pine species named belong to the subgenus Hap- loxylon. Concerning the aecia on Pinus pumila (Pall.) Reg., see Cronartium kamtschaticum J0rst. In the western parts of North America, from Washington State to north- western Kansas and central Nevada, a closely related species is encoun- tered — Cronartium occidentale Hedge, Bethel et Hunt — on species of Ribes with aecia on Pinus edulis Engelm., and P. monophyla Torr. et Frem. These pines are related to the subgenus Haploxylon section Paracembra. The literature concerning Cronartivun ribicola, which is extremely injurious to the American Weymouth pine as well as to currants, is very extensive. In the control of this fungus preventive measures are held to be the most important (Vanin, 1934; Bondartsev,"Bolezni kul'turnykh rastenii" (Diseases of Cultivated Plants, 1931, p. 239)). General distribution: Europe, Asia (n). North America. On Pinus strobus L. — EUROPEAN PART: (Leningrad Region), Bait. (Estonian SSR, Lithuanian SSR). U. V. (Moscow Region; Yaroslav'l), U. Dnp. (Kiev), M. Dnp. (Kursk Region; Shchigry; Ukrainian SSR: Priluk,Uman). On Pinus sibirica (Rupr.) Mayr. (= P. cembra var. sibirica Rupr.) — EUROPEAN PART: (Leningrad Region: Leningrad, Staryi. FIGUR
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