FUNGI: THE WILLOW MILDEW. 



*35 



Exercise 46. 



225. The Willow Mildew. — Take dried leaves, or those freshly collected, 

 which show some of the whitish mycelium, and numerous black fruit bodies- 



Fig. 114. ^ 



Leaves of willow showing willow mildew. The black dots are the fruit bodies (perithecia) 

 seated on the white mycelium. 



Observe the white mycelium. • Is it scattered unevenly over the surface of the 

 leaf, or does it form more or less circular spots? Is there any difference in 



