325 



22. Gymnosporangium germinale (Schw.) Kern, Bull. Torrey Club 

 35:506. 1908. 



Caeoma germinale Schw. Trans. Am. Phil. Soc. II. 4:294. 1832. 



Gymnos'porangium clavipes Cooke & Peck; Cooke, Jour. Quek. Club 

 2:267. 1871. 



Roestelia auruntica Pk. Bull. Buffalo Soc. Nat. Sci. 1:68. 1873. 

 On Malaceae: I. 



Cydonia vulgaris (L.) Pers., Smyrna, July 15, 1895, comm. 

 J. C. Stockley; Felton, Aug. 1897, F. D. Chester. 

 On Juniperaceae : III. 



Jnniperus virginiana L., Iron Hill, May 1897, F. D. Chester; 

 Seaford, April 14, 1908, (2252). 



Dr. W. G. Farlow was the first to conduct culture experiments with 

 this species. In 1883 (Proc. Am. Acad. Sci. 20:313. 1885) using telia 

 from Jinnperus virginiana he succeeded in obtaining the development of 

 pycnia on leaves of Mains Mains, Aronia arbntifolia and Amelanchier 

 canadensis, but aecia did not develop. 



Dr. R. Thaxter (Bot. Gaz. 11:236. 1886; Proc. Am. Acad. Sci. 

 22:264. 1887) conducted similar cultural work obtaining well developed 

 aecia on A meknichier canadensis and pycnia on Mains Mains. 



Dr. J. C. Arthur in 1907 (Jour. Myc. 14:18. 1908) using material 

 on Juniperiis sibirica from Illinois secured infection on leaves of Amelan- 

 chier intermedia and on fruit of A. erecta with development of pycnia 

 only. In 1908 the same author (Mycol. 1:239. 1909) using telial ma- 

 terial from J. virginiana from Kentucky succeeded in developing pycnia 

 and aecia on Crataegus sp. In 1909 (Mycol. 2:229. 1910) successful 

 infection of Amelanchier erecta with development of aecia in abundance 

 and of Crataegus punctata with development of pycnia only was ob- 

 tained. Telial material from ./. sibirica from Michigan was used in 

 these experiments. In 1910, (Mycol. 4:24. 1912) using telial material 

 from Wisconsin on /. sibirica, successful infection of Amelanchier erecta 

 and Crataegus tomentosa was obtained resulting in abundant aecia in 

 both cases. Aeciospores from the Amelanchier were used in June 1910 

 to inoculate J. sibirica resulting in the development of telia the follow- 

 ing spring. 



