Bui. 380, U. S. Dept. of Agriculture. 



Plate XV. 



ENDOTHIA PARASITICA. VERTICAL SECTIONS OF STROMATA. X 49. 



Fig. 1 .—Showing a Young, Simple Pycnidial Cavity at the Base. Fig. 2.— In Which 

 Neither Pycnidia Nor Perithecia Have Begun to Develop. Fig. 3.— With 

 Irregular Chambered Pycnidia. 



All the above are about the same age — four months after hioculation. 



