taamm 



UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 380 



Contribation from the Bureaa of Plant Industry 

 WM, A. TAYLOR, Chief 



Washington. D. C. 



PROFESSIONAL PAPER 



January 15, 1917 



ENDOTHIA PARASITICA AND 

 RELATED SPECIES 



By 



C. L. SHEAR, Pathologist, and NEIL E. STEVENS, Pathol- 

 ogist, Fruit-Disease Investigations, and RUBY J. TILLER, 

 Scientific Assistant, Office of Investigations 

 in Forest Pathology 



CONTENTS 



Taxonomy 



Introduction . . . 



The Crenus Endothia 



The Species of Endothia 



Morphology and Development . . . . 



Mycelium 



Stromata * . . . . 



Spore Measurements 



Physiology 



Cultural Studies 



Distribution of the Species of En- 

 dothia 



1 

 1 



3 

 13 

 22 

 22 

 23 

 30 

 36 

 36 



48 



Page 

 Physiology — Continued 



Discovery of Endothia parasitica In 



China . . 54 



Discovery of Endothia parasitica in 



Japan 58 



Present Distribution of Endothia 



parasitica in America 59 



Host Relations of the Species of En- 

 dothia 59 



Summary . ' . . 74 



Literature Cited 77 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1917 



