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PHYTOPATHOLOGY 



[VOL. 6 



hundred yards and more from the nearest pines as on those in closest 

 proximity to Peridermium galls. In the midst of an unusually heavy 

 infection of Peridermium it is not uncommon to find the oaks immediately 



FIG. 2. Typical older gall of Peridermium harknessii on Pinus radiata from type 

 locality. The aecia are confluent but not typically cerebroid. 



adjoining infected pines quite free from Cronartium. In many cases 

 where old, richly sporulating galls stand within a foot of the nearest 

 oak branches, so close that in a heavy wind they must necessarily touch 

 each other, the oak leaves were found to be without a sign of Cronartium. 



