316 



UREDINACEAE. 



7. Cronartium cerebrum (Peck) Hedgcock & Long, Jour. Agr. Res, 

 2:247. 1914. 

 Peridermium cereht-um Pk. Bull. Buff. Soc. Nat. Sci. 1:68. 1873. 

 Aecidiiun giganteum Mahr. Wald. Nordam. 120. 1890. 

 Cronartium Quercuum Miyabe; Shirai, Bot. Mag. Tokyo 13:74. 1899. 

 Peridermium fusifor^ne Arth & Kern, Bull. Torrey Club 33:421. 1906. 

 On Pinaceae: I. 



Pinus virginiana Mills., Seaford, April 1908, (2250). 

 On Fagaceae: II, III. 



Quercus coccinea Wang., Seaford, July 9, 1907, (1645). 

 Querent digitata (Marsh.) Sudw., Seaford, July 9, 1907, (1641, 

 1642) (Barth. Fungi Columb. 2720) ; Lewes, Aug. 14, 1907, 

 (2249). 

 Quercus marylandica Moench., Seaford, July 9, 1907, (1646, 

 1647, 1652), (Barth. Fungi Columb. 2719); Lewes, Aug. 14, 

 1907. 

 Quercufi nigra L., Seaford, July 9, 1907, (1643). 

 The first record of culture work with this species was made by 

 Shirai (Bot. Mag. 13:74. 1899). He successfully inoculated Quercus 

 serrata, Q. variabilis and Q. glandulosa in Japan, with aeciospores of 

 Peridermium giganteum (Mahr.) Tubeuf from native Pinus sp. 



Shear (Jour. Myc. 12:89. 1906) was the first in America to report 

 successful inoculation indicating the connection of Peridermium cerebrum 

 with the American Cronartium on Quercus sp. He conducted out-of- 

 door inoculation experiments in the vicinity of Washington, D. C, using 

 aeciospores of Peridenniutn cerebrum on Pinns virginiana to infect Q. 

 coccinea. The experiments resulted in the formation of uredinia followed 

 by telia. He also records convincing field observations confirming the 

 above mentioned culture work. 



Arthur in the same year (Jour. Myc. 13:194. 1907) confirmed Shear's 

 results under greenhouse control by obtaining successful infection on Q. 

 veliitina which resulted in the formation of uredinia and telia following 

 sowings with aecial material furnished by Dr. Shear, on Pinus virginiana. 

 These results were confirmed by the same author in 1910 (Mycol. 4:26. 

 1912) when infection was obtained on Q. rubra using aecia on P. vir- 

 giniana from the same locality. 



