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6 Wood Discoloration

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7.2 White Rot 141<br />

Fig.7.3. Manganese deposits occurring during decay of a Scots pine sapwood block by<br />

Physisporinus vitreus. A <strong>Wood</strong> sample with black manganese deposits after culture (from<br />

Schmidt et al. 1996). B TEM-micrograph showing electron-dense material in the hyphal<br />

slime layer (c) and the secondary wall (b). C TEM/EDX spectra of manganese and other<br />

elements in different areas of the attacked wood (see B). a control from a healthy area within<br />

the S2, b spectrum from the S2 beneath a hypha, c spectrum from dense deposit material<br />

within the hyphal slime layer. The copper peaks result from the metal grids. (from Schmidt<br />

et al. 1997a)<br />

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