54 
weather. Its extension is checked by a spell of dry weather bu 
even under those circumstances plants that have been attacked 
contain but a small amount of sugar. 
The fungus appears as a very delicate lilac-coloured mould, 
which frequently covers the entire under surface of the leaf, and 
in some instances appears also on the upper surface, tnfected 
leaves are readily recognised by being deformed and twisted, and 
by the presence on their under surface of the mould, which con- 
sists of a dense forest of slender threads emerging through the 
-3. 
FS*> 

i 
■ fruit of the f • w 
2 and 3 highly masnifi^ 
' spores of the 
