. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. 38o DISEASES OF CULTIVATED PLANTS When the object is to grow healthy trees for whatever pur- pose, all diseased trees should be cut down and burned at once, as when the mycelium has once gained an entrance it extends in the trunk from year to year. Polyporus dryadeus (Fries.). This is our largest species of Polyporus, and is not infrequently met with on oak trunks ; the largest specimens usually occur near the ground-line, but it also springs from points
. Diseases of cultivated plants and trees. Plant diseases; Plants -- Wounds and injuries; Plants, Protection of; Trees -- Diseases and pests. 38o DISEASES OF CULTIVATED PLANTS When the object is to grow healthy trees for whatever pur- pose, all diseased trees should be cut down and burned at once, as when the mycelium has once gained an entrance it extends in the trunk from year to year. Polyporus dryadeus (Fries.). This is our largest species of Polyporus, and is not infrequently met with on oak trunks ; the largest specimens usually occur near the ground-line, but it also springs from points where branches have died or been ^ ^^••''-'''^UlkliMMto. Fig. 117.—Polyporus bctiilini/s. Fungus and section of same, reduced. broken off. According to Hartig, during the decomposition of the wood by the mycelium, oblong yellowish or whitish blotches appear in the otherwise sound heart-wood. The cell-walls of these white blotches have been converted into cellulose, and have become isolated by the solution of the middle lamella. These patches are gradually dissolved, and holes surrounded by hard wood are formed. Sporophore bracket-shaped or hoof-shaped, 7-12 in. across, attached by a broad base, becoming corky in substance,. 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 Massee, George, 1850-1917. New York : Macmillan
Size: 980px × 2551px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910
