Changes in wood microstructure through progressive stages of decay
U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1968 - Medical - 46 pages
The sequence of changes observed microscopically that occurred in wood throughout successive stages of decay was studied in the sapwood of a hardwood, sweetgum (Liquidambar styraciflua L.), and of a softwood, southern pine (Pinus sp.). The fungi used were Polyporus versicolor L. ex Fr., a white-rot fungus, and Poria monticola Murr., a brown-rot fungus. Light microscopy, plus the techniques of polarization and ultraviolet-absorption microscopy, was used to make the observations on sections 4 microns thick cut from celloidin-embedded specimens. (Author).
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Proliferation of Hyphae in Decaying Wood
Effects of Decay on Walls of Sweetgum Fibers and Pine Tracheids
2 other sections not shown
2-methoxyethanol 50 percent advanced stages air-dried appeared attack birefringence brown rotter brown-rot fungus brown-rotted pine brown-rotted wood cavities cell separation cell wall layers cell wall substance celloidin cellulolytic enzymes cellulose removed Channels of hyphal checking of secondary compound middle lamella Cowling 11 cross sections cross-sectional area decay fungi decayed wood decomposition degradation difference early stages Effects of Decay embedding ethylene oxide fast green Figure Forest Products Laboratory hemicellulose high lignin content hyphae hyphal advance increase in lumen lumen area Meier 35 microscopical observed occurred percent residual weight pine tracheids pit canals ray parenchyma cells regions relative wall area reported residual weight category resistance S2 and S3 S2 layer safranin and fast sample blocks secondary wall shrinkage softwood sound pine sound wood specimens stages of brown stages of decay stained sweetgum and pine sweetgum fibers thickness types of decay ultraviolet opacity ultraviolet radiation weight loss white rotter white-rot fungus