Memoir 88 



Plate II 



1 liHTW WdTfiir ■ 



SYMPTOMATOLOGY OF THE DISEASE, AND MORPHOLOGY OF THE PATHOGENE 



A, Base of wheat plant, showing lesions on culms and on roots. B, Asci and ascospores ( X 130.3). 

 C, Longitudinal section of a wheat plant showing structure and contents of the perithecia (X 39.4). D, 

 Two perithecia developed below the outer leaf sheath; the oblique beaks illustrate one of the most char- 

 acteristic features of the species (X 24). E, The lower part of a culm of a wheat plant infected with 

 take-all, showing protruding beaks of the perithecia (X 3.3). F, A part of the mycelial plate found about 

 the base of the culm ( X 130.3) 



