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6 Wood Discoloration

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122 6 <strong>Wood</strong> <strong>Discoloration</strong><br />

Fig.6.2. Molding. a Substrate surface with various molds (REM, photo W. Kerner). b Molding<br />

of insufficiently dried and then plastic-covered paneling<br />

sealed wood, like plastic-coated paneling (Fig. 6.2b), during sea transport of<br />

round timber and wood products under deck and in chip piles of pulp industry.<br />

Among 427 isolates from stacked yellow-poplar lumber, Penicillium<br />

implicatum and Aspergillus versicolor accounted for 29.7 and 14.5%, respectively<br />

(Mikluscak and Dawson-Andoh 2004b).<br />

Thehyphaepenetratethewoodonlyafewmillimetersandliveonparenchyma<br />

cells (sugar, starch, protein). In the laboratory, some species degraded<br />

isolated pectin, hemicelluloses, and cellulose, but not lignified cell walls. Thus,<br />

wood strength properties remain unchanged.<br />

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