Artiore IIT.— Parasitic Fungi of Illinvis. Part. By T. J. 
BURRILL, Professor of Botany, Illinois Industrial University. 
INTRODUCTION 
Most of the plants herein described were collected in Tlli- 
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 nunibers, 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 IJllinois 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: DeThtimen’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. G. Farlow, and the State Botanist of New 
York, Chas. H. Peck; to F. 8. Earle, J.C. Arthur, and C. A. 
Hart, for the contribution of specimens found by them in Mli- 
nois, and to Professor Wm. Trelease, J. B. Ellis, and others for 
several favors. 
