Practical Forestry 



all the affected foliage drops off prematurely. After lyirig 

 on the ground during the winter, the thread-like spores are 

 produced in large quantities at the time when the foliage 

 of the sycamore is appearing in May and June. The 

 sycamore is not the only~tree affected by this fungus, for 

 the Norway Maple ancT'our native Acer campestre are equally 



POPYPORUS SQUAMOSUS (ON ELM TREE) 



liable to attack, and have in some instances suffered very 

 severely from this cause. The fungus is becoming more 

 plentiful, and it disfigures the maple and sycamore leaves to 

 a wide extent. 



Rhytisma punctata may at once be distinguished from 

 the above species by the many small black spots studded 

 thickly together, which combine to form the large conspicu- 



