Davis—Parasitic Fungi in Wisconsin — III. 
251 
NOTES ON PARASITIC FUNGI IN WISCONSIN—III. 
Supplementary to a provisional list of parasitic fungi in Wis¬ 
consin. Trans. Wis. Acad. Sciences, Arts & Letters 17:2:846- 
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. 15:5:484). Peck’s original bi¬ 
nomial was TJredo 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/x in di¬ 
ameter; endospore 3—4y thick; oogonia 37—40/x filled by the 
oospores. 
Pcronospora 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 :197 et seq.). 
Pcronospora 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 
