Davis — Notes on Parasitic Fungi in Wisconsin — VII. 407 
Onoclea Struthiopteris should have been given as a host of 
Sclerotium deciduum Davis, the pre-selerotial stage having been 
collected on that host at Barron in 1907. 
Additional Species 
While collecting along a branch of Main Creek near Hawkins, 
my attention was arrested by the powdered appearance of the 
leaves of Laportea. After failing to locate wood borers in a posi¬ 
tion to be responsible for the appearance, a magnifier was used 
which showed the presence of a Synchytrium as the cause. As 
it seems somewhat different from the forms on various hosts that 
have been referred to Synchytrium aureum Schroet., I have 
thought it better to keep it separate. 
Synchytrium pulvereum n. sp. (Fig. 1). 
Galls epiphyllous, discrete, simple,' prominent (up to 130/*), 
contracted at base, at first yellow, then castaneous; resting spor¬ 
angia single, spherical, castaneous, wall laminated and about 5/* 
thick, 40-90/* in diameter. On leaves of Laportea canadensis . 
Fig. 1. Vertical section of gall and resting sporangium of Synchytrium 
pulvereum n. sp. Drawn by Charles Drechsler with the aid of camera 
lucida. Highly magnified. 
