Davis—Notes on Parasitic Fungi in Wisconsin — IV. 671 
NOTES ON PARASITIC FUNGI IN WISCONSIN—IV: 
J. J. Davis. 
A provisional list of parasitic fungi in Wisconsin was pub¬ 
lished in the Transactions of the Wisconsin Academy of Science, 
Arts & Letters, 17 2 :846-984. Supplementary notes bearing 
the title above were issued in the same publication, 18 1 :78-92 
(I) 93-109 (II) and 251-271 (III). 
Parasitic fungi were less abundant in Wisconsin than usual 
in 1915. This may be attributed to a reversal of season in the 
spring, a warm April having been followed by a cold May. 
In the first number of these notes there was mention of the 
occurrence of Plasmopara humuli Miyabe & Takahashi on 
Humulus Lupulus at Racine in southeastern Wisconsin. This 
seems to be the first, and as yet the only, American locality from 
which this Japanese mildew has been reported. In September, 
1915 it was collected on the same host near Lynxville on the 
Mississippi and at Gays Mills and Petersburg in the Kickapoo 
valley in western Wisconsin. At Lynxville the Japanese host 
Humulus japonicus was abundant on vacant lots and it was 
also observed at Gays Mills in cultivation and as an escape but 
the mildew was not found on this species. 
Dimerosporium collinsii (Schw.) Thuem. is referred to a new 
genus, Apiosporina, by von Hoehnel. (Fragm. zur Mykol. no. 
506). 
For the 1 ‘black knot” fungus recorded under the name Plow- 
riglntia morbosa (Schw.) Sacc. the new genus Dibotryon is pro¬ 
posed by Theissen and Sydow. (Ann. My col. 13: 663.) 
The fungus recorded in the provisional list under the name 
Dotkidell'a ulmea (Schw.) Ell. & Evht. and referred to in 
