78 Wisconsin Academy of Sciences, Arts, and Letters. 



NOTES OX PARASITIC FUNGI IN WISCONSIN-!. 



J. J. Davis. 



These notes are intended to be supplementary to "A provisional 

 List of Parasitic Fungi in Wisconsin" published in Trans- 

 actions of the Wisconsin Academy of Sciences, Arts and 

 Letters. Vol. XVII, pt. 2, pp. 846-984. 



Plasmopara humuli Miyabe & Takahashi. This was collected 

 on wild Humulus Lupulus growing along the river bank at 

 Racine in 1909-10 since which time the station has not been 

 visited. The following notes of this fungus were made at 

 Racine: Spots small, angular at first, limited by the vein- 

 lets, brown-red or purplish above, below of a darker green 

 than the leaf, giving the ''water soaked" appearance. The 

 spots are surrounded by an indeterminate yellowish discoloration 

 especially early in the season, less marked as the leaves become 

 firmer, and finally assume the lethal brown with the death 

 of the tissues included. Conidiphores hypophyllous, grey, 

 175-325x5-6 1 /2/* with usually two lateral branches each of which 

 is about equal in development to the terminal portion and 1-3 

 times branched, ultimate branchlets tapering, subacute ; conidia 

 fuligineous tinted, elliptical, somewhat acute at each end, fur- 

 nished with an apical papilla of dehiscence, 20-33 x 12-1 7/*, usu- 

 ally about 26 x 15/x ; oospores scattered in the leaves ; oogonia ir- 

 regularly thickened, brown, subglobose, 36-40/z long, oospores 

 filling the oogonia 30-33^ long. 



Asterina plantaginis Ellis. This is referred to Mycosphaer- 

 ella by Theissen (Ann. My col. 10:2:196. (Apr. 1912). 



Asterina rubicola Ell. & Evht. This is described by Theissen 

 in the same communication (p. 195) but no new combination is 

 proposed. 



