. Manual of tree diseases . Trees. POPLAR DISEASES 309 Catise. The common white wood-rot of deciduous trees is caused by the fungus Fomes igniarius (= Fames nigricans). The spores from the tubes on the under surface of the sporophores are wind- blown and cause infec- tion through branch wounds where heart- wood is exposed. The mycelium delignifies the wood elements and partially destroys the cellulose. For a more detailed discussion of the life history and con- trol of the wood-rot fungi of living trees, see page Fig. 61. — Lengthwise section through fruitiug-body of Fomes igniarius. Refe
. Manual of tree diseases . Trees. POPLAR DISEASES 309 Catise. The common white wood-rot of deciduous trees is caused by the fungus Fomes igniarius (= Fames nigricans). The spores from the tubes on the under surface of the sporophores are wind- blown and cause infec- tion through branch wounds where heart- wood is exposed. The mycelium delignifies the wood elements and partially destroys the cellulose. For a more detailed discussion of the life history and con- trol of the wood-rot fungi of living trees, see page Fig. 61. — Lengthwise section through fruitiug-body of Fomes igniarius. References Schrenk, Hermann von, and Spaiilding, P. White heart-rot caused by Fomes igniarius. In Diseases of deciduous forest trees. U. S. Dept. Agr. Bur. PI. Ind. Bui. 149: 26-37, pis. 1-3. 1909. Schrenk, Hermann von, and Spaulding, P. Heart-rot caused by Fomes nigricans. In Diseases of deciduous forest trees. U. S. Dept. Agr. Bur. PI. Ind. Bui. 149 : 42-^14. 1909. Atkinson, G. F. Polyporus igniarius. In Studies of some shade tree and timber destrojdng fungi. Cornell Univ. Agr. Exp. Sta. Bui. 193 : 214-222, figs. 71-79. 1901. Hartig, R. Polyporus igniarius Fr. In Die Zersetzungserscheinungen des Holzes etc., pp. 114^123, pis. 15-16. 1878. Hesler, L. R., and Whetzel, H. H. White heart-rot. In Manual of fruit diseases, pp. 72-76, figs. 20-21. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Rankin, W. Howard (William Howard), b. 1888. New York : The Macmillan Company
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