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



Plate IX. 



*t!^i t ^^ 



'-^"■^.^ " . 



'40**^ 



ENDOTHIA GYROSA. VERTICAL SECTIONS OF STROMATA ON 



BEECH. X 32. 



FiQ. 1.— Showing Numerous Pycnidial Cavities andTwo Mature Perithecia. 

 Fig. 2.— Showing Mature Pycnidia and Perithecia Side by Side. 



Except where otherwise indicated, t)ie photomicrographs of stromata are from unstained 

 sections cut with a freezing microtome. 



