[Vol. 2, 1915] 



658 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Explanation of Plate 



plate 21. 



This plate is a photographic reproduction, X%, of Plate 1 by 

 Woronini of the various galls produced by Vaccinium vitis-idaea 

 when parasitized by Exobasidium Vaccinii. The original plate is 

 colored and with all figures natural size; red colors of the orig- 

 inal have photographed light colored. 



Fig. 1. Leaf spot gall, on left side of uppermost leaf; the leaf is reddish on 

 the upper side in the infested area, not deformed, and was felty or scurfy on the 

 lower side. 



Figs. 2-9. Leaf concavity galls. More or less deformation of the infected 

 region is present here. 



Figs. 10-15. Shoot galls of the wax-like or coralloid type. Extended por- 

 tions of leafy shoots are infected. Figure 11 shows whole branchlets completely 

 hypertrophied. 



Figs. 16-17. Flower galls borne on, and a part of, shoot galls. 



Fig. 18. Flower gall. Local infection of a single flower, noted as the only 

 such instance observed. 



1 loc. cit. 



