PLATE 29 1 

 Bacterium viiians: 



A. — Lettuce from Beaufort, S. C, showing stems blackened by the disease. Photo- 

 graphed by Dr. J. Rosenbaum. 



B. — Lettuce leaves from South Carolina, showing spotted-leaf type of the disease. 

 In many cases the stems were sound. 



1 Photographs and photomicrographs reproduced in Plates 29 to 41 were made by Mr. James F. 

 Brewer, except as otherwise stated. 



