PLANT BACTERIA, VOL. 2, 



PLATE 5A, 





-'W 





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 oiBacl. tumefacU'ns. 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. 



