FUNGI: THE WILLOW MILDEW. 



135 



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 



