PLANT BACTERIA. VOL. 2. 



PLATE 56. 



&$^**a*& 



ft 



Crown Gall of Daisy. 



Cross-section of petiole from an inoculated plant showing the central leaf-trace enlarged and converted into a pseudo stem by the 

 parasitism of Bad. tumefaciens. The reason for the stem structure of the leaf tumor lies in the fact that the tumor-strand 

 infecting this leaf-trace is an outgrowth from a primary tumor on the stem. The remainder of the petiole is normal. Slide 

 634 B 10. 



