USDA Forest Service 

 Research Paper INT-256 

 July 1980 



INFLUENCE OF TEMPERATURE AND SPORE STAGE 

 ON PRODUCTION OF TELIOSPORES BY 

 SINGLE AECIOSPORE LINES OF CRONARTIUM RIBICOLA 



Geral I. McDonald and Duane S. Andrews 



Intermountain Forest and Range Experiment Station 

 U. S. Department of Agriculture 

 Forest Service 

 Ogden, Utah 84401 



