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FIG. 48.—Transverse section of oak timber destroyed by 
Polyporus sulphureus. (R. Hartig.) 
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Fic. 49.—Highly magnified longitudinal radial section of 
a piece of oak destroyed by a timber fungus, showing 
the ravages of the hyphz in the various tissues. (Rk. 
Hartig.) 
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