. Fungous diseases of plants, with chapters on physiology, culture methods and technique . -probable that their distribution is eftected by means of insects,which may be attracted by droplets of a sugary substance whichmay accumulate on the under surfaces of the sporophores. 462 FUNGOUS DISEASES OF PLANTS VIII. POLYPORUS: OTHER SPECIES In addition to the species described at length, the followingmay be mentioned also as among those of special importance,. Fig. 228. PoLYPORus borealis on Living Tsuga. (Photograph by Geo. F. Atkinson) occurring in Europe and in America, which have received moreo
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . -probable that their distribution is eftected by means of insects,which may be attracted by droplets of a sugary substance whichmay accumulate on the under surfaces of the sporophores. 462 FUNGOUS DISEASES OF PLANTS VIII. POLYPORUS: OTHER SPECIES In addition to the species described at length, the followingmay be mentioned also as among those of special importance,. Fig. 228. PoLYPORus borealis on Living Tsuga. (Photograph by Geo. F. Atkinson) occurring in Europe and in America, which have received moreor less recent consideration from the standpoint of shade andforest tree diseases. AUTOBASIDIOMYCETES 463 Polyporus borealis (Wahl.) Fr. is a characteristic and destructivedisease of the spruce in Europe, and it occurs on a variety of conifersin America.^ The bracketed sporophores are clustered, as shownin Fig. 228. They are fleshy for some time, but finally tough anddry. The spores are minute, measuring 4-5 X 3 /Lt. The myceliumdevelops abundantly in the wood with typical markings (Fig. 229). f\i 1 v.^ 1 Fig. 229. Polyporus borealis: Longitudinal Section of Log,SHOWING Mycelium. (Photograph by Geo. F. Atkinson) Polyporus carneus Nees causes a red rot, or peckiness, in thecommon red cedar {Jimiperns virgmiana) and in the southern redcedar {Jimipenis barbadensis)^ as well as in other ^ Polyporus Juniperinus von Schrenk is apparently the ca
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