Preliminary List of Wisconsin Parasitic Fungi. 



who has also contributed many interesting forms from 

 La Crosse and elsewhere. A few species have been 

 received from correspondents, whose contributions are 

 acknowledged in each instance. 



Professor W. G. Farlow, of Harvard University, has aided 

 me very materially in the determination of doubtful species. 

 My thanks are also due Dr. M. C. Cooke, Prof. C. H. Peck and 

 Mr. J. B. Ellis for similar assistance. 



Where names different from those in common use have 

 been employed, in deference to European authority, the 

 synonym most frequently used is added in parenthesis. 



As the list now stands it includes about 270 species on ap- 

 proximately the same number of hosts, most of which are 

 phaenogamic plants. This number will probably be nearly 

 doubled by a few years' .collecting, especially through the 

 addition of imperfect forms belonging to Cercosjjora, 

 Septoria, and related form-genera. To this end, I shall be 

 grateful for specimens from any part of the state, and will 

 gladly render any assistance in my power in their identi- 

 fication. 



CHYTRIDINEAE. 



1. Synchytrium fulgens Schroeter, var. decipiens Farlow. 



Very common, on Amxiliicarpaea monoica Nutt. Madison, Ithaca; 

 La Crosse, Pammel. 



2. Synchytrium anemones (D C). 



Common, on Anemone nemorosa L. Madison. 



SAPROLEGNIEAE. 



3. Saprolegnia ferax (Gruitbus), form Thuretii De Bary. (S. dioica 



Auct,)' 

 On dead flies thrown in water. Madison. 

 This species has ROt been found occurring parasiiically with us, but it is 

 frequently known to attack living aquatic animals, especially fish, and is 

 the chief cause of the destructive salmon disease of England. It was ob- 

 tained on some cultures started with cistern water in the spring of 1882, 

 and again, in the fall of 1883, in water taken from a ditch. Antheridia 

 have not been observed. A small percentage of the oogonia show a 

 pseudo-pollinodium projecting into the base of the cell from below. 



