. Fungous diseases of plants, with chapters on physiology, culture methods and technique . r DestroyingFungi. Cornell Agl. Exp. Sta. Built. 193: 208-214. 1901. SCHRENK, H. VON. Polyporus sulfureus (Bull.) Fr. Div. \>g. Phys. and Path.,U. S. Dept. Agl. 25: 40-52. pis. 11 (in part), 13. 1900. The sporophores of no other fungus present, probably, a morestriking appearance than the fresh, vigorous, sulfur-yellow clusterof the above species. It cannot be considered a very virulentdisease-producing organism, in spite of its wide distribution and 458 FUNGOUS DISEASES OF PLANTS the variety of host
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . r DestroyingFungi. Cornell Agl. Exp. Sta. Built. 193: 208-214. 1901. SCHRENK, H. VON. Polyporus sulfureus (Bull.) Fr. Div. \>g. Phys. and Path.,U. S. Dept. Agl. 25: 40-52. pis. 11 (in part), 13. 1900. The sporophores of no other fungus present, probably, a morestriking appearance than the fresh, vigorous, sulfur-yellow clusterof the above species. It cannot be considered a very virulentdisease-producing organism, in spite of its wide distribution and 458 FUNGOUS DISEASES OF PLANTS the variety of host plants upon which it is reported. This fungushas been found practically throughout the world where trees is unquestionably more abundant in humid climates, yet minoror nonpersistent, unfavorable conditions do not readily affect it. This Polyporus is of special interest because of its occurrenceupon a laige variety of trees. Deciduous trees are more commonlyattacked, yet both in Europe and America it is not infrequentlyfound upon conifers. It is perhaps oftener noticed upon such. ^^^S Fig. 226. Polyporus sulphureus on Exposed Roots of a Living Tree(Photograph by L. H. Childers) forest and shade trees as oak, walnut, butternut, ash, black locust,poplar, and willow. Among orchard trees the cherry in old orchardsis a common host, but pear and apple trees are also , the sporophores of this fungus may appear upon fallentrunks and stumps, and it appears to be true that the mycelium ofthe fungus may develop extensively in fallen trunks. The coniferous trees upon which it has been more frequentlyobserved are the larch in Europe and the hemlock and spruce inAmerica. AUTOBASIDIOMYCETES 459 The mycelium evidently establishes itself in a saprophytic man-ner upon dead branches or in the decayed wood about knot holes,thence gaining entrance to the heartwood of the main growing for years in the latter, it may develop sporophores
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