180 
Mycolcgia 
It was also found that western yellow pine trees growing on 
very thin soil, on steep south or east slopes where growth condi- 
tions are poor have a higher percentage of western red rot than 
trees situated where the growth conditions are good. 
Office of Investigations in Forest Pathology, 
Bureau of Plant Industry, 
Albuquerque, N. Mex. 
