LITERATURE CITED 211 



Reed, G. M., Marjorie Swabey, and Laura A. Kolk, "Experimental studies 



of head smut of corn and sorghum," Bull. Torrey Botan. Club, 54: 295- 



310, 1927. 

 Rodenheiser, H. A., "Physiologic specialization in some cereal smuts," 



Phytopathology, i#: 955-1003, 1928. 

 "The origin of physiologic races in the smut fungi by hybridization," 



Genetics of Pathogenic Organisms, Am. Assoc. Adv. Sci., 73-76, 1940. 

 Rodenheiser, H. A., and E. C. Stakman, "Physiologic specialization in 



Tilletia levis and Tilletia tritici," Phytopathology, 11: 247-253, 1927. 

 Salmon, E. S., "On Erysiphe graminis DC, and its adaptive parasitism within 



the genus Bromus," Ann. My col., 2:255-267, 307-343, 1904. 

 "Cultural experiments with biologic forms of the Erysiphaceae," Phil. 



Trans. Roy. Soc. Lo?idon, Ser. B., 191: 107-122, 1904a. 

 "Recent researches on the specialization of parasitism in the Erysiphaceae," 



New Phytopathologist, 3: 55-60, 1904. 

 Savulescu, T., and T. Rayss, "Contribution a la connaissance des Pero- 



nosporacees de Roumaine," Ann. Mycol., 28: 297-320, 1930. 

 Schreiber, F., "Resistenzziichtung bei Phaseolus vidgaris," Phytopath. Z., 



4:415-454, 1932. 

 Schroeter, J., "Entwickelung einiger Rostpilze," Beitr. Biol. Pflanzen, 3: 69- 



70, 1879. 

 Stager, R., "Infectionsversuche mit Gramineen-bewohnenden Claviceps- 



arten," Botan. Z., 61: 111-158, 1903. 

 Stakman, E. C, "Physiologic specialization in pathogenic fungi," Proc. 



Intern. Congr. Plant Sci. Ithaca, 2: 1312-1330, 1926. 

 "The problem of specialization and variation in phytopathogenic fungi," 



Genetica, 18: 372-389, 1936. 

 Stakman, E. C, J. J. Christiansen, and H. E. Brewbaker, "Physiologic 



specialization in Puccinia sorghi," Phytopathology, 18: 345-354, 1928. 

 Stakman, E. C, J. J. Christiansen, C. J. Eide, and B. Peturson, "Mutation 



and hybridization in Ustilago zeae," Minn. Agr. Expt. Sta. Tech. Bull., 



65: 108 pp. 1929. 

 Stakman, E. C, and M. N. Levine, "The determination of biologic forms 



of Puccinia graminis on Triticum spp.," Minn. Agr. Expt. Sta. Tech. 



Bull., 8: 1-10, 1922. 

 Stakman, E. C, M. N. Levine, and D. L. Bailey, "Biologic forms of 



Puccinia graminis on varieties of Avena spp.," /. Agr. Research, 24: 1013- 



1018, 1923. 

 Stakman, E. C, M. N. Levine, and R. U. Cotter, "Origin of physiologic 



forms of Puccinia graminis through hybridization and mutation," Set. 



Agr., 10: 707-720, 1930. 

 Stakman, E. C, M. N. Levine, R. U. Cotter, and L. Hines, "Relation of 



barberry to the origin and persistence of physiologic forms of Puccinia 



graminis? J. Agr. Research, 48:953-969, 1934. 

 Stakman, E. C, M. N. Levine, and L. Hines, "Relation of barberry to the 



origin and persistence of physiologic forms of Puccinia graminis? J. 



Agr. Research, 48:951-969, 1934. 



