A Study of Meadow- Crop Diseases in New York 125 



Physiologic specialization and parasitism of Helmintho- 



sporium sativum. Minnesota Agr. Exp. Sta. Technical bul. 37: 

 1-101. 1926. 



Christensen, J. J., and Stakman, E. C. Physiological specialization 

 and mutation in Ustilago zeae. Phytopath. 16:979-999. 1926. 



Clark, Charles F. Variation and correlation in timothy. Cornell 

 Univ. Agr. Exp. Sta. Bul. 279:419^70. 1910. 



Clevenger, Joseph F. Notes on some North American Phyllachoras. 

 Journ. mycol. 11 : 159-164. 1905. 



Clinton, G. P. Chlorosis of plants with special reference to calico of 

 tobacco. In Eeport of the botanist. Connecticut Agr. Exp. Sta. 

 Rept, 1914:357HL24. 1915. 



Cook, Mel. T., and Helyar, J. P. Diseases of grains and forage 

 crops. New Jersey Agr. Exp. Sta. Circ. 51:1-8. 1915. 



Cooke, M. C. Phyllachora trifolii (Pers.). In Synopsis Pyrenomycetum. 

 Grev. 13:63. 1884. 



Clover black mould. In Fungoid pests of cultivated plants, 



p. 247. 1906. 



Coons, George Herbert. Factors involved in the growth and the 

 pycnidium formation of Plenodomus fuscomaculans. Journ. agr. 

 research 5:713-769. 1916. 



Craigie, J. H. Discovery of the function of pycnia of the rust fungi. 

 Nature 120:765-767. 1927. 



Crawford, R. F. Powdery mildew of peas. New Mexico Agr. Exp. Sta. 

 Bul. 163:1-13. 1927. 



Cunningham, H. S. A study of the histologic changes induced in leaves 

 by certain leaf-spotting fungi. Phytopath. 18:717-751. 1928. 



Davis, W. H. The aecial stage of alsike clover rust. Iowa Acad. Sci. 

 Proc. 24:461^472. 1917. 



Summary of investigations on clover rusts. Mycologia 



16:203-219. 1924 a. 



Spore germination of Ustilago striaeformis. Phytopath. 



14:251-266. 1924 b. 



Two physiological forms of Ustilago striaeformis (Westd.) 



Niessl. Abstr. in Phytopath. 18:149. 1928. 



