Bui. 213, Bureau of Plant Industry, U. S. Dept. of Agriculture. 



Plate XXVIII. 



Cross section of a daisy stem 10 days after inoculation with Bacterium tumefaciens: 

 N, Normal epidermis and cortical parenchyma. V, Vascular bundles nearly unchanged. 

 T, T, T, Rapidly proliferating tumor tissue at a distance of 1 or 2 mm. from the needle 

 puncture. The tissue is pushed up over this hyperplasia from a to b, indicating location 

 of the future gall. 



