FOURTH SUPPLEMENTARY LIST OF PARASITIC 
FUNGI OF WISCONSIN. 
J. J. DAVIS. 
In 1884 Doctor William Trelease, at that time holding the 
professorship of botany in the University of Wisconsin, pre¬ 
pared a Preliminary List of the Parasitic Fungi of Wisconsin, 
which was published in the Transactions of the Wisconsin 
Academy of Sciences, Arts, and Letters, vol. VI (1884). Sup¬ 
plementary lists, prepared by the writer, were issued through 
the same publication, in vols. IX (1893), XI (1897), and 
XIY (1903.) Of these this list is a continuation. Lite 
them it consists of a list of additional hosts, a list of additional 
species and an index to the hosts mentioned. The numbers 
attached to the entries in the first are those under which the 
species were first reported in these lists while those of the 
second are serial and consecutive to those of the preceding lists. 
Unless otherwise indicated it is to be understood that the 
specimens upon which the entries are based are in my her¬ 
barium and that when the name of the collector is not given 
(in parenthesis) that the compiler is also the collector. 
I wish to tender my thanks to those who have assisted in the 
preparation of the list and especially to Prof. Robert A. Harper 
and the botanical staff of the University of Wisconsin for 
services and material kindly given, Dr. J. C. Arthur and Mr. 
F. D. Kern of Purdue University for determination of the 
Uredinales, and Dr. G. P. Clinton of the Connecticut Agri¬ 
cultural Experiment Station for similar service in the 
TJstilag inales. 
The names proposed by Dr. Arthur, pycnia (O) aecia (I) 
uredinia (II) and telia (III) have been used for the forms of 
the Uredineae. 
