~?i'B 



UNITED STATES DEPARTMENT OP AGRICULTURE 

 BULLETIN No. 380 



Contribution from the Bureau 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 



Page 



Taxonomy 1 



Introduction 1 



The Genus Endothia 3 



The Species of Endothia 13 



Morphology and Development .... 22 



Mycelium 22 



Stromata • . . . . 23 



Spore Measurements 30 



Physiology 36 



Cultural Studies 36 



Distribution of the Species of En- 

 dothia 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 



