PLANT BACTERIA. VOL. 2. PLATE 5b. 
ak ae Seer 
ce Boe 
“@2. 
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ie 
a 
Sa 
c, 
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 Bact. 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 to. 
