90 Nebraska Agricultural Exp. Station, Research Bui. 12 
DESCRIPTIOX OF PLATE XI 
A. Camera lucida drawing of longitudinal section of apple wood 
showing invading hyphae. The wood cells are not broken down but 
the hyphae pass from one to the other thru the pitted walls. 
B. Camera lucida drawing of cross section of apple wood and 
invading hyphae. 
