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, 15-30x11^-2*1 ; conidia similar, sometimes catenulate 

 12-24x1-1%/*. On Caltha palustris. Gaslyn, Burnett Co., 

 Aug. 30, 1911. 



Cercosporella 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 1 /^-3 1 / 4^. ; conidia cylindrical, 

 straight, hyaline, continuous or obscurely septate, 20-40x1-2/*. 

 On Phryma Leptostacliya. 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/*. 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 



