﻿Dodge: Effect of host on Gymnosporangium 541 



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Fig. I. Sorus on leaf of Chamaecypay 



Fig. 2. Two sori in swollen conditio 

 months after leaves were collected and dr: 



Fig. 3. Small leaf of Aronia nigra sh 



Figs. 4-6. A leaf of Aronia arbutifc 

 various stages in the development of t 

 aecidia. Fig. 4 photographed May 27; Fig. 5 same leaf Jur 

 galls; Fig. 6 side view of the same leaf June 20. Natural size. 



Fig. 7. Growing point of twig of Aronia nigra one mon 

 Photographed May 22. Natural size. 



Fig. 8. The same twig July 22. The leaves on the low 

 had fallen off early in June, but the gall remained dark green ui 



