Diseases of economic plants (1921) Diseases of economic plants diseasesofecon00stev Year: 1921 302 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 sulphurcus showing . tree. After von Schrenk effect upon wood of oak 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 o

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Diseases of economic plants (1921) Diseases of economic plants diseasesofecon00stev Year: 1921 302 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 sulphurcus showing . tree. After von Schrenk effect upon wood of oak 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 ohfusus Berk.).—The black oaks

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