Dodge and Adams: Gymnosporangia on Myrica 29 



Orton, C. R., & Adams, J. F. Notes on Peridermium from Pennsylvania. 



Phytopathology 4: 23-26. pi. 3. 11 Mr 19 14. 

 Reed, H. S., & Crabill, C. H. The cedar rust disease of apples caused by 



Gymnosporangium Juniperi-Virginianae Schw. Virginia Agr. Exp. Sta. 



Tech. Bull. 9: 1-106. /. 1-23. My 1915. 

 Sorauer, P. Handbuch der Pflanzenkrankheiten 2: /. 509. Berlin. 1906. 



Explanation of Plates 

 Plate 2. Gymnosporangium Ellisii — Aecidium myricatum 

 Fig. 1. Leaf of Myrica carolinensis infected at one point showing crowded 

 aecidia. Natural size. 



Fig. 2. Portion of the same leaf. X 2%. 

 Fig. 3. A group of aecidia from an infected bud. X 5. 

 Fig. 4. A number of aecidia showing the white, recurved, peridial seg- 

 ments. X 20. 



Fig. 5. A small witches'-broom on Chamaecyparis showing numerous 

 teleutospore sori in the dry condition. About natural size. 



Plate 3. Rust on Comptonia asplenifolia 



Fig. 1. Twig and bud infected; aecidia just beginning to show. Natural 

 size. 



Fig. 2. Infected leaf coiled up ; aecidia scattered sparingly on under side 

 and along the branch which is also infected for some distance. 



Fig. 3. Another leaf showing that the lobes and midrib portion are much 

 thickened. Peridial segments broken away and lying about on the leaf sur- 

 face. X 2. 



Fig. 4. Portion of the same branch shown in Fig. 2. The white spots 

 show where aecidia are forming. X 2. 



