Davis — Parasitic Fungi in Wisconsin — III. 251 



NOTES OX PARASITIC FUNGI IN WISCONSIN— III. 



Supplementary to a provisional list of parasitic fungi in Wis- 

 consin. Trans. Wis. Acad. Sciences, Arts & Letters i7:2:846- 

 984. 



J. J. Davis. 



The fungus recorded in the provisional list under the name 

 Synchytrium decipiens Farl. is referred to the chytridiaceous 

 genus Woroninella by H. Sydow using the combination W. aeci- 

 dioides (Pk.) Syd. (Ann. Mycol. X2:5:484). Peck's original bi- 

 nomial was Uredo aecidioides which had been proposed previ- 

 ously for another fungus which fact has been held by some my- 

 cologists to invalidate the publication ; hence the use of another 

 specific name. 



Oospores occur in Wisconsin collections of Plasmopara ribi- 

 cola Schroet. They are globose, brown, smooth, 33-36/* in di- 

 ameter ; endospore 3 — 4/x thick ; oogonia 37 — 40/i, filled by the 

 oospores. 



Peronospora parasitica (Pers.) Tul. Guy West Wilson pro- 

 poses the division of this into two species and a like treatment of 

 P. effusa (Grev.) Ces. (Mycologia 6:191 et seq.). 



Peronospora trifoliorum D By., does not occur on clover in 

 Wisconsin as far as observed even in fields where both Trifolium 

 and Medicago are abundant and the latter infected. The conidia 



