328 



13:200. 1907; 14:17. 1908; Mycol. 4:24. 1912) pycnia were again 

 obtained on apple following sowings from telial material from Indiana. 

 In 1915 Reed and Crabill (Tech. Bull. Va. Exp. Sta. 9:43-45. 1915) 

 report the results of numerous infection experiments on different varie- 

 ties of cultivated apples. Their experiments bring out strongly the 

 well established fact that some varieties are susceptible and other rela- 

 tively or totally immune. They also show that only young leaves are 

 susceptible. 



25. Gymnosporangium Myricatum (Schw.) Fromme, Mycol. 6:229. 



1914. 

 Caeoma (Aecidium) Myricatum Schw. Trans. Am. Phil. Soc. II. 

 4:294. 1832. 



Podisoma Ellisii Berk. Grevillea 3:56. 1844. 

 Gymnosporangium Ellisii Farl., Ellis N. A. Fungi 271. 1879. 

 On Myricaceae: I. 



Myrica cerifera L., Seaford, July 9, 1907 (16-!8). 

 On Juniperaceae: III. 



Cluunaecyparis thyoides (L.) B. S. P., Seaford, April 14, 1908 

 (2251). 

 Fromme (1. c.) has shown by infection experiments and field obser- 

 vations that the well known Gymnosporangium Ellisii has for its aecial 

 stage Aecidium Myricatum. This is especially remarkable since only 

 one other Gymnosporangium (G. Blasdaleanum) has been definitely 

 shown by infection experiments to have aecia of the cupulate type, and 

 since no other species of GjTnnosporangium is known to have an aecial 

 host in other than the Rosales. 



26. Gymnosporangium nidus-avis Thaxter, Bull. Conn. Exp. Sta. 107:6. 



1891. 

 On Juniperaceae: III. 



Jnnij)eriiH virginiana L., Lewes, April 15, 1908 (2243). 

 This species produces largely "witches' brooms" on the red cedar. 

 Thaxter conducted culture experiments in 1886 and in 1887 (Proc. 

 Amer. Acad. 22:264. 1887; Bot. Gaz. 14:167. 1889) in which he infected 

 Amelanchier canadensis with production of pycnia and aecia in abun- 

 dance using sporidia of the above species, at that time undescribed, but 

 referred to G. cunicuni. In 1891 Thaxter (1. c.) stated "infections with 



