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PLATE XXV. 
Fig. 1— Photomicrograph of a transverse section of 
normal chestnut oak (Quercus prinus) wood, X 35. 
Fig. 2.— Photomicrograph of a transverse section of chest- 
nut oak (Quercus prinus) wood decayed by Polyporus par- 
gamenus, showing a reticulum of matted hyphe bounding 
the original pockets or decayed areas, X 30. 
