Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 422 DISEASES OF ECONOMIC PLANTS The pore-bearing sporophores are hoof-shaped, smooth above, and concentrically ridged and gray. Below they are red-brown. Rot (Fomes ap- planatus (Pers.) Wallr.). — The shelving, pore- bearing sporo- phores are very large, woody, and grayish to brown above, and are commonly found on dead wood, more rarely upon live trees. Rot (Poly- porns pinicola (Schwartz) Fr.). — The causal fungus is of world-wide dis- tribution upon conifers, espe- cially spruce, pine, fir, and
Diseases of economic plants (1910) Diseases of economic plants diseasesofeconom02stev Year: 1910 422 DISEASES OF ECONOMIC PLANTS The pore-bearing sporophores are hoof-shaped, smooth above, and concentrically ridged and gray. Below they are red-brown. Rot (Fomes ap- planatus (Pers.) Wallr.). — The shelving, pore- bearing sporo- phores are very large, woody, and grayish to brown above, and are commonly found on dead wood, more rarely upon live trees. Rot (Poly- porns pinicola (Schwartz) Fr.). — The causal fungus is of world-wide dis- tribution upon conifers, espe- cially spruce, pine, fir, and hemlock. It occurs also upon birches and other deciduous trees. Entrance is made through wounds of any kind. The rotted wood is brittle, cracked, and permeated by numerous sheets of mycelium. In early stages of decay it passes through red-brown to dark-brown, then small, white areas of numerous shapes and irregu- Fig. 182. Fomes applanatus upon trunk of dead tree. After Freeman.
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