File:Bulletin (1953) (20428117705).jpg

Title: Bulletin
Identifier: bulletin2619531955illi (find matches)
Year: 1918 (1910s)
Authors: Illinois. Natural History Survey Division
Subjects: Natural history; Natural history
Publisher: Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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282 Illinois Natural History Survey Bulletin Vol. 26, Art. .1
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Fig. 2.—Typical crack in the bark of a wilt-killed oak tree. The crack resulted from growth of a fungus mat beneath the bark. gether as a mycelial mat. The mat varies in size from 1 by 1 cm. to 48 by 14 cm. The central pad is elongated oval to ellip- tical, dull green to black in color, and has a daedaloid surface. It is pseudoparen- chymatous in structure and is usually free of visible loose mycelium. The following arbitrary classification, based on the stage of development or de- cline, was given to the mycelial mats ex- amined in the study reported here. A mat of each class is shown in fig. 3. Class I. An immature or fresh mat, still in the rapid growth phase, with mycelium light tan or buff in color and having a firm, light- to dark-colored central pad which shows no sign of decline. Class II. A mature mat, with mycelium and central pad beginning to darken slightly, the pad being firm and showing no definite signs of deterioration; vege- tative growth appearing to have ceased or nearly ceased. Class III. An aging mat, with mycelium and central pad becoming darker, the pad beginning to shrink or crack slightly from drying; showing other definite signs of aging but not deteriorating. Class IV. A declining mat; mycelium and pad very dark or black, usually with only parts of the pad remaining intact; showing definite signs of rapid decline. Class V. A deteriorating mat and pad, having lost nearly all consistency and hav- ing been reduced to a mass of dry, or wet, black soil-like material. Methods of Field Sampling Trees in the five study areas were thor- oughly examined twice each month from October 1, 1952, to July 31, 1953. Some mats were examined and, after being sam- pled, were left on the trees. Others were removed from the trees and taken to the laboratory for study. Still others were tagged and left undisturbed for various periods of time. Metal picnic boxes equipped with ice containers were used for storing and transporting collected mate- rial from the field to the laboratory. When the ice containers were kept filled with ice, the temperatures of the boxes were maintained below 16 degrees C, usu- ally between 5 and 12 degrees, even during the hottest days of summer. The time I

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