Davis—Parasitic Fungi in Wisconsin■ — I. 
91 
angular, immarginate, limited by the veinlets, becoming conflu¬ 
ent, brown, more abundant near the margin of the leaf; conidio- 
phores epiphyllous, tufted from a stromatoid base, erect, simple, 
hyaline, 15-30x114-2//,; conidia similar, sometimes catenulate 
12-24xl-l 3 /2 ( u. On Caltha palustris. Gaslyn, Burnett Co., 
Aug. 30, 1911. 
Cercgsporella exilis n. sp. Spots round to angular, lim¬ 
ited by the. veinlets, often confluent, brown, 2-5 mm.; conidio- 
phores in small loose tufts which are effused over the lower sur¬ 
face of the spots, hyaline, continuous, usually subulate, nearly 
straight, seldom branched, 10-20x2*4-3 \ conidia cylindrical, 
straight, hyaline, continuous or obscurely septate, 20-40x1-2//,. 
On Phryma Leptostachya. Madison, Blue Mounds and Devils 
Lake, August and September. 
Cladosporium paeoniae Pass. On Paeonia (cult.) Madison. 
Pending an investigation of the diseases of paeonies in the 
United States, which I am informed,is to be made, I use this name 
provisionally. 
Cladosporium gloeosporioides Atk. On Hypericum virgin- 
icum. Grand Rapids (Peltier) and Madison. This forms def¬ 
inite alutaceous spots on the leaves. When, ; however, the host 
plants are in a thick overshadowing growth of Carices and other 
taller plants the hyphae are borne on indefinite discolored areas. 
Frequently all gradations may be seen on a single host; on the 
upper leaves, exposed to the sunlight, the hyphae being confined 
to definite tan colored spots while on the lower they are borne 
on indefinite subolivaceous areas. I find the length of the hyphae 
variable; in some specimens 20-30//,, in others ca. 60/x. Dr. R. A. 
Harper has kindly compared this with specimens of Gloeospor- 
ium cladosporioides Ell. & Hals, in the Ellis Herbarium and tran¬ 
scribed the following notes from the inside of one of the enve¬ 
lopes; “Hyphae 35-40x4//,, fasciculate, nodulose above, hyaline 
becoming dark; conidia oblong-elliptical 10-14x4-6 microns”. 
Dr. Harper writes: 
“The spores seem like those on your material but the fungus 
on Halsted’s material seems to be almost if not entirely on the 
stem. His host plant, of course, has narrow leaves quite differ¬ 
ent from yours. I did not get a good preparation of the conidio- 
phores; I should think the two might be the same but I am 
