A—Upper surface of leaflet inoculated when quite mature with overwintered teliospores o 
late or summer crop. Note abundant production of telia and scanty infection 
B—Lower surface of same leaflet shown in A. Note development of telia almost to the exclu¬ 
sion of aecia 
C—Upper surface of leaflet inoculated when young with overwintered teliospores from the 
early crop on the stems. Note abundant production of telia among the pycnia and the 
vigorous infection 
D.—Lower surface of leaflet shown in C. Note abundant development of aecia with an occa¬ 
sional telial sorus. Contrast with B 
