Davis—Parasitic Fungi in Wisconsin — III . 261 
Uredinopsis atkinsonvi Magn. Primary uredinia and telia on 
Aspidium novel oracense. St. Croix Falls. 
In the provisional list no aecia on Pinus were recorded save an 
undetermined Peridermium on leaves of Pinus Banksiana. This 
was not because of the absence of such rust forms from the state, 
but because field work had not been done in the proper regions 
at the proper time to detect them. Since the list was prepared, 
however, some attention has been given them, the results of which 
it may be of interest to summarize. 
The leaf Peridermium on Pinus Banksiana was collected in 
July 1907, near Gordon, Douglas County, and at Spooner, Wash¬ 
burn County. It is presumably connected with Coleosporium 
but has not been observed since. Peridermium cerebrum Pk. 
occurs throughout the range of Pinus Banksiana in the state and 
is quite abundant in some localities. Its effects are serious only 
when the infections are multiple or when it attacks the axis. 
The distribution of Peridermium pyriforme Pk. is also probably 
coextensive with the range of Pinus Banksiana in the state it 
having been collected in Jackson, Douglas and Yilas Counties, 
but it appears to be very sparsely distributed. In June, 1914, 
when special attention was given to it, no more than one speci¬ 
men was collected in any locality. If this is connected with 
Cronartium comandrae Arth. it is not nearly so abundant or 
widespread as the telial form. Peridermium comptoniae Orton 
& Adams on the contraiy, while it has been observed only in 
Douglas and Yilas Counties, occurs in considerable abundance 
both as to number of trees attacked and the extent of the out¬ 
break on the individual tree. As I have seen it this usually oc¬ 
curs on the trunk near the base while Peridermium pyrijorme 
Pk. I have seen only on branches. This is contrary to the state¬ 
ment of Arthur & Kern (Mycologia 6: 132). Besides its native 
host, Pinus Banksiana , this rust attacked the young trees of PL 
nus ponderosa in the plantation of the Board of Forestry in. 
Yilas County with severity; a severity due in large measure,, 
doubtless, to the fact that the rust does not occur in the native 
habitat of this host and hence there has been no breeding out of 
susceptibility. Of the European Peridermium fischeri Kleb. 
which became thoroughly established on Pinus sylvestris in Door 
County, I have written elsewhere. It is hoped that with the de¬ 
struction of the alternate host, Sonchus, this will disappear from 
