[Vol 10, 102:1] 



70 ANNALS OF THE MISSOURI BOTANICAL (iAKI)EN 



Explanation of Plate 



plate 1 



Pig. 1. Affected plant shewing characteristic blackening of stalk and lower 



branches. 



Fig. 2. Similarly affected plant. Lower parts of main stalk and one of the 

 lateral branches cut awaj to show destruction and blackening of medullary region. 



Pig. 15. 1'oung plants prostrated by the disease. Note external signs at 

 base of stalks. The pathogen moved upward into the stalks from the seed piece. 



Pic. 1. Median longitudinal section of a recently infected stem showing 

 disease advancing in the pith. 



