PLATE 59 

 Prunus leaves from inoculation experiments: 



A. — P. cerasus, infected by a strain from P. cerasus, series lo (Table II). 



B. — P. cerasus, uninoculated, series lo. 



C. — P. pennsylvanica, infected by naturally discharged ascospores from a leaf of 

 P. pennsylvanica, series iB (Table V). 



D. — P. cerasus, infected by naturally discharged ascospores from a leaf of P. cerasus, 

 series loi (Table II). 



E. — P. virginiana, infected by a strain from P. virginiana, series 13 (Table VII). 



