PLATE 5 
Crowngalls on sunflowers which resulted from inoculations in the condensed region 
of elongation. 
# A.—The needle passed through the position marked a. Fifteen intemodes were 
involved so heavily that normal expansion was prevented. Xf. 
B. —The needle passed through the position marked b. Expansion was reduced 
only in the lower intemodes of the thirteen involved. “Secondary galls** appear on 
a petiole at c and d. Xy- 
C. —Similar to B except that the stem is split longitudinally revealing a dark line 
of tumor tissue which extends up from the region of puncture in the pith. Paraffin 
sections made from the pith at f showed this dark line to be a series of “ tumor strands" 
which have developed m varying degrees. Some of them are shown in D to F. X|. 
D. —One of the strands of tumor tissue which appeared in a cross section of the sun¬ 
flower pith taken from C, f. Hyperplastic cells may be seen at g, hypertrophic 
cells at h, and crushed pith cells at i. X57. 
E and F.—Similar to D. Hyperplastic cells appear at g, while vascular elements 
have developed at j. X57. . 
The photomicrographs mown in this plate were made from paraffin sections stained 
with Flemming’s triple stain. 
