18 CIRCULAR NO. 131, BUREAU OF PLANT INDUSTRY. 



On corn meal Endothia 'parasitica was constantly characterized 

 by the early production of numerous small pycnidia and the want of 

 any distinct color changes in the medium, while in E. radicalis the 

 pycnidia are few and large, appearing later, and the medium becomes 

 perilla purple. In E. radicalis mississippiensis the pycnidia are 

 larger and less numerous than in E. parasitica and the color of the 

 mycelium is orange chrome at the end of a week. E. gyrosa is dis- 

 tinguished from E. parasitica by its very tardy spore production and 

 the formation of elevated or subcolumnar pycnidial stromata. 



[Qr. 131] 



