Freeman: MINNESOTA UREDINE. 5D. 
33. P. nardosmie E. & E. Journ. Myc. 1: 85. 1885. 
On Petasttes palmata(Ait.) A. Gray: St. Louis, (IID) Jy. 
1886, Holway 232. 
34. P. porphyrogenita Curt. Thiim. Myc. Univ. No. 545. 
1876. 
On Cornus canadensis L.: St. Louis, (III) Jy. 1886, Hol- 
way 108; St. Louis, (III) Je. 1893, Sheldon 4622. 
35- P. hydrophylli Peck & Ciint. Rep. N.Y. St. Mus. Nat. 
Hist. 30: 54. 1879. 
On Hydrophyllum virginicum L.: Hennepin, (III) My. 
~ 1891, Sheldon 1968 and 1981; Meeker, (III) Je. 1892, 
Frost 37 ; Ramsey, (III) My. 1892, Sheldon 1969 ; Aitken, 
(III) Je. 1892, Sheldon 2072 ; , (III) 1893, Sheldon 
5803; Hennepin, (III) My. 1899, Freeman 310. 
ao FE. tiarella B. & C. N. A. Fungi, No. 549. 188r. 
On MWitella nuda L.: St. Louis, (III) Jy. 1886, Holway 62. 
37. P. halenie Arto. & Hotway, Rep. Bot. Wk. in Minn. 
a 30. © 5886. 
On Zetragonanthus deflexus (J. E. SmirH) Kuntze: St. 
Louis, (III) Jy. 1886, Holway roo. 
38. P. mesomegala B. & C. Grev. 3: 53. 1874. 
On Clhintonia borealis (Arr.) Rar.: St. Louis, (III) Jy. 
1886, Holway 18. 
39. P. xanthii ScHWEIN. Syn. Fung. Car. Sup. 500. 1822. 
Berkeley and Ravenel have described a variety ambrosze. 
The spores on Ambérosza do not, however, differ morpholog- 
ically from those on Xanthium. 
On Xanthium canadense MiLu.: Hennepin, (III) O. 1889, 
MacMillan; Brown, (III) Jy. 1891, Sheldon 861 and 
1008; Carver, (III) Jy. 1891, Ballard 756; Lincoln, 
(III) Ag. 1891, Sheldon 1262; Otter Tail, (III) Ag. 
1892, Sheldon 3898; Traverse, (III) S. 1893, Sheldon 
7259; Hennepin, (III) S. 1898, Butters: Ramsey, (III) 
Jy. 1899, Freeman 531; Houston, (III]) Ag. 1899, Lyon 
458. 
Ambrosia trifida L.: Lincoln, (III) Ag. eer, Sheldon 
1266; Brown, (III) Ag. 1891, Sheldon 122 
Gymnoconia LAGERH. 
Separated from Puccznza on account of the ecidia, which 
are destitute of a pseudoperidial wall and are at first covered 
only by the epidermis of the host. 
