. Fig. 191. —• Fomes fomentarius showing hoof-shaped sporophore. After Atkin- son. tough. The upper surface is Sapwood rot ^^^ (Fomes fomentarius abounds throughout the northern part of the United States, as one of the most common diseases of deciduous trees, chiefly affecting the beech and birch. Decay begins in the outer sapwood and proceeds in- ward. The wood is marked by irregular black lines, the boundaries between diseased and normal wood. When en-

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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921