Bui. 1286, U. S. DeDt. of Agriculture 
Plate VI 
Magnified Portion of a Leaf, Showing Details of the Stromatic 
Rings 
The black masses and circles consist of large numbers of minute spherical fruiting bodies of 
the fungus, the pyenidia and perithecia. They break through the upper surface of the leaf 
and may occur singly or fused laterally in groups, arranged around the border of the spot. 
(Magnification X 7) 
