. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 474 FUNGOUS DISEASES OF PLANTS a considerably advanced stage of decay in the region of the cam- bium, including both wood and bark. There is present an abundant white mycelium and very characteristic mycelial strands, as subse- quently described. The abundant, white mycelium is particularly rich in stored nutrients. It commonly extends several feet above the crown, mostly between the wood and bark. The characteristic mycelial cords, by which this fungus is best known, are shining,
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 474 FUNGOUS DISEASES OF PLANTS a considerably advanced stage of decay in the region of the cam- bium, including both wood and bark. There is present an abundant white mycelium and very characteristic mycelial strands, as subse- quently described. The abundant, white mycelium is particularly rich in stored nutrients. It commonly extends several feet above the crown, mostly between the wood and bark. The characteristic mycelial cords, by which this fungus is best known, are shining, gray-black. Fig. 235. Armillaria mellea on a Stump of White Oak (Photograph by Geo. F. Atkinson) strands which may measure from 1 to 2^ mm. in diameter. They are typical rhizomorphs. These begin as complex hyphal masses which become readily sclerotial in character. These strands attain enormous lengths. They may course upward and downward in the affected tree, generally under the bark, or merely in close contact with the outer surface of the bark. They also grow through the soil to considerable distances, thus serving to spread the disease to neighboring trees. According to Hartig this strand is differ- entiated near the apex into several layers. The outer, more gelati- nous layer becomes somewhat horny; some loose hyphse, however,. 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 Duggar, Benjamin M. (Benjamin Minge), 1872-1956. Boston ; New York : Ginn
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