. 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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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1920, bookyear1921