PLATE 108 
Crowngall from a leaf notch of Bryophyllum calycinum, showing 3 shoots and 35 roots. 
The arrow indicates the dividing line between naked tumor tissue (below) and the 
stretched, lifted up cortex (above) which contains normally oriented cells and sur¬ 
rounds disoriented tumor cells. Rs, roots; R, pushed up cortex where a root origi¬ 
nating in the pericycle of the larger shoot has not yet reached the surface. At X 
another leaf notch was inoculated, but the tumor tissue (shown to be present by means 
of serial sections) is quiescent and the shoot is barely visible; yet judging from results 
obtained on the orange, 1 it might later have developed into a tumor as large as the 
upper one, especially if that had been removed. Inoculated June n, 1920. Photo¬ 
graphed September 22. X5. 
1 Smith, Erwin F. an introduction To bacterial diseases of plants. Fig. 342. Philadelphia 
and London. 1920. 
