Davis—Notes on Parasitic Fungi in Wisconsin — Till. 425 
Fig. 2. A. Vertical section of an immature perithecium of Lopho- 
dermium thuyae n. sp., showing unusual-thickening of the upper wall. 
Magnified about 150 diameters. B. Vertical section of a mature peri- 
theeium of the same. C. An ascus and paraphysis magnified about 350 
diameters. Drawn with the aid of camera lucida by Charles Drechsler. 
Phyllosticta platanoidis. Sacc. 
On Acer Negundo. Madison. 
Phyllosticta bacteriospora Vnill. 
On Tilia americana. Mellen. 
What is perhaps Asteroma populi Rob. & Desm. has been col¬ 
lected at Mellen on Populus tremuloides. The material is young 
and the “fibrils” are not yet black. 
S'tagonospora arenaria Sacc. 
To this species I have referred collections on leaves on Elymus 
canadensis from Mellen. The leaves bear blackish brown spots, 
bnt the pycnidia are found also in paler portions of the leaves. 
The sporules are 20-33 x 3^/i, triseptate. Exceptionally 1-, 4-, 
or 5- septate sporules occur. 
