B. 
C. 
D. 
SOME DISEASES OF NURSERY ELMS 
Cytosporina infection in an advanced 
cankerous stage. 
Phoma infection with the fungus sporu- 
lating through the bark. 
Vermicularia discoloration in the wood. 
Young Coniothyrium infection, typical 
of the first appearance of most wilts. 
E and F. Advanced stages of Coniothyrium 
infection ready to produce spores. 
