site on its natural host. In case the original descriptions were 

 meager, inaccurate or obsolete, the descriptions were amplified. 

 Credit is given at the proper place when tlie description is taken 

 verbatim from a monograph, etc. 



All the drawings are original and were made by the author. The 

 same microscope and camera lucida were used and therefore all 

 the fungi were drawn on a imiform scale. The magnification in 

 every instance is appended to the description. 



To avoid confusion a generic name of long standing was used. 

 A reference at the proper place was made to the recent terminolog)'. 



The writer wishes to thank the members of the staff of the New 

 York Botanical Garden for tlie permission to examine specimens in 

 the Crj-ptoganiic herbarium, for the library facilities and for many 

 helpful suggestions. The writer is also under great indebtedness to 

 Prof. J. C. Arthur, who not only determined the rusts but freely 

 oitered advice and criticised that portion devoted to the Uredinales, 

 to Dr. G. P. Clinton for determining the smuts, and to Prof. F. C. 

 Stewart, Geneva, N. Y., Doctors R. A. Harper, W. A. Murrill, F. J. 

 Seaver, A. B. Stout, Donald Reddick, V. B. Stewart, C. L. Shear, 

 J. J. Davis and F. D. Fromme for helpful suggestions. 



The writer is also under great indebtedness to Prof. Melville 

 Thurston Cook, head of the Department of Plant Pathology of the 

 New Jersey Agricultural Experiment Station, who directed the 

 work, for his encouragement, advice, helpful suggestions and cooper- 

 ation in preparing the descriptions, for the arrangement of the 

 plates and for reading the proof. 



(4) 



