538 MINNESOTA BOTANICAL STUDIES. 
In Sargent’s Sylva* is a statement that pines are sometimes sub- 
ject to the distortions known as witches’ brooms. Dr. Farlow 
writes, however, that this statement was based on a reported 
witches’ broom on Prxus ponderosa from Montana and that 
further study of the material demonstrated that the distortions 
Were not typical witches’ brooms, nor were they caused by a 
fungus parasite. No definite statement as to the cause of the 
broom of white pine collected in Minnesota can be made until 
older material is obtained and a more detailed description is 
therefore deferred. 
DESCRIPTION OF PLATE XXXII. 
Witches’ broom on Pinus strobus, Mille Lacscounty, Minn. After 
photograph by R. S. Mackintosh, May, 1goo. 
I. MELAMPSORACES. 
Chrysomyxa UNGER. 
One species of this genus has been found. Common on 
Pyrolas throughout the State. 
1. C. pirolatum (KoERN.) WinT. Die Pilze1': 250. 1884. 
On leaves of: 
Pyrola rotundifolia L.: Goodhue, (II) Je. 1893, Ballard ; 
Freeborn, (II) My. 1891, Sheldon 5964 and 5963. 
Pyrola elliptica Nutt.: Aitken, (II) Je. 1892, Sheldon 
2101; Houston, (II) Je. 1899, Lyon 98: Mille Lacs, (II) 
My. 1900, H. B. Carey and Freeman 560. 
Pyrola secunda L.: St. Louis, (Il) Jy. 1886, Holway 27. 
[ Uredo pyrole (Gm.) Wint. ] 
Cronartium F Ries. 
Not yet collected by the survey staff, but one species has been 
reported by Seymour. 
1. C. asclepiadeum (WILLD.) Fr. Obs. Myc. 1: 220. 1815. 
Var. quercuum B. & C. 
Crow Wing, (III) Ag. 1884, Seymour. (Economic Fungi. 
A. B. Seymour and F. S. Earle, No. 215.) 
Coleosporium LEVEILLE. 
One species found. Very abundant throughout the State. 
Uredospore form most abundant and conspicuous. Only one 
collection of the teleutospores has been made. 
* Sylva of N. A. 11: 12. 
