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JOURNAL OF FORESTRY 



The matter of the relations between aspen Htter and the fungi, 

 Botrytis and Herpotricliia, appears to have httle weight. The more 

 permanent aspects of aspen are most noticeable at lower elevations, al- 

 though these diseases are most virulent at high elevations. Alpine fir 

 is susceptible to this disease, and the blackened matted leaves are no 

 infrequent sight, yet alpine fir admittedly is a vigorous invader of as- 

 pen stands. On Douglas fir and white fir the evidences of Hcrpo- 

 trichia are very rarely seen and accordingly these species should be 



Fig. I. — Typical two-aged stand. Manti National Forest. 



even more safe under aspen than alpine fir is. The writer does not 

 deny the possibility of destruction of young trees through the agency 

 of these fungi, but he has never seen an example of it personally and 

 does not believe the disease a formidable agent of destruction. 



A plantation of Douglas fir made in the fall of 1916 under dense 

 aspen was found practically all dead the following spring, with the 

 leaves covered with a light gray cobwebby fungus, but planted Douglas 

 firs which had been established several years stood among the dead 

 ones entirely undamaged. On this account, as well as the fact that the 

 fungus was growing densely upon some cut juniper branches and ma- 

 nure near by, it seemed more likely that the fungus is secondary and 



