Diagnosis of Decay in Wood 
lines in living Betula papyrifer 
cer saccharum infected with Ft 
ad. C.—Zone line in Picea cam 
3ut and extends inward where 
i by Xylaria polymorpha. Zor 
Plate 4 
—Zone line developed 
the line paralleling the 
i line follows irregularly 
luced in fallen trunk of 
areas which originate 
mtarim 
