Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 362 Diseases of Economic Plants other trees. The wood turns brown, and crumbles under pressure. The rot extends from 3-4 m. above and below the sporophores. These are pore-bearing, triangular in section. Fig. 189. — Polyporus sulphureus showing effect upon wood of oak tree. After von Schrenk. The upper surface is very hard and bears fine, irregular fissures parallel to the edge. When mature, the upper surface is red-brown. The pores are barely visible without a hand lens. Soft-rot {Polyporus

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Diseases of economic plants (1921) Diseases of economic plants diseasesofeconom01stev Year: 1921 362 Diseases of Economic Plants other trees. The wood turns brown, and crumbles under pressure. The rot extends from 3-4 m. above and below the sporophores. These are pore-bearing, triangular in section. Fig. 189. — Polyporus sulphureus showing effect upon wood of oak tree. After von Schrenk. The upper surface is very hard and bears fine, irregular fissures parallel to the edge. When mature, the upper surface is red-brown. The pores are barely visible without a hand lens. Soft-rot {Polyporus obtusus Berk.). — The black oaks

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