Article III. — Parasitic Fungi of Illinois. Part I. By T. J, 

 BuRRiLL, Professor of Botany, Illinois Industrial University. 



INTKODUCTION 



Most of the plants herein described were collected in Illi- 

 nois during 1881 and 1882. by Mr. A. B. Seymour, who was 

 employed for the purpose by the Illinois State Laboratory of 

 Natural History. The entire collection consists of three thou- 

 sand seven hundred and eighty-four numbers, many of which 

 are of course duplicates, or are different stages of the same 

 species, leaving, however, a very large number of distinct spe- 

 cific forms — much larger than is usually supposed to exist in 

 our flora. 



The determinations have been made at the Illinois Indus- 

 trial University by myself, efficiently aided by Mr. Seymour. 

 For this work, besides the facilities offered by the library and 

 herbarium of the University, the State Laboratory of Natural 

 History furnished many books and specimens. Among the lat- 

 ter are the following sets of exsiccata: DeThiimen's Mycotheca 

 Universalis, Ellis' North American Fungi. Ravenel's Fungi 

 Caroliniani and Fungi Americani. 



The entire work has been stimulated and aided in every 

 possible way by Professor S. A. Forbes, as director of the State 

 Laboratory, and as an earnest and efficient worker in our rich 

 fields of scientific and practical biology. Acknowledgements 

 are also gratefully made for assistance in various ways, espe- 

 cially in the determination of specimens submitted to their in- 

 spection, to Prof. W. Gr. Farlow. and the State Botanist of New 

 York, Chas. H. Peck; to F. S. Earle, J. C. Arthur, and C. A. 

 Hart, for the contribution of specimens found by them in Illi- 

 nois, and to Professor Wm. Trelease, J. B. Ellis, and others for 

 several favors. 



