JACKSON: UREDINALES OF OREGON 219 



qua Nat. Forest, near Distort, Lane Co., Oct. 27, 1909, Geo. G. Hedg- 

 cock; Philomath, Jan. 6, 1914, 32q8; Wren, Benton Co., Aug. 3, 

 1914, 3296; Ashland, Jackson Co., Sept. 10, 1914, 32Q/; Mary's 

 Peak, Benton Co., Feb. 7, 1914, G. H. Godfrey, 3301, Aug. 15, 1914, 

 3302; N, slope Mt. Hood, 4,000 ft., Aug. 9, 1914, 1616. 

 On Polypodiaceae : II, III. 



Pteridium aquilmum pubescens Underw.- — Corvallis, Sept. 1909, 

 1142, July, 1910, 1082, Aug. 1910, 10^8, Oct. 6, 1914,3709; Bonneville, 

 Multnomah Co., Aug. 11, 1910, loyd; Scappose, Columbia Co., 

 July 25, 191 1, io6y; North slope Mt. Hood, Aug. 9, 1914, i6iy; 

 Ashland, Jackson Co., Sept. 10, 1914, IQQ3; Portland, Aug. 24, 1915, 

 E. Bartholomew (Barth. N. Am. Ured. 1485); Grant's Pass, Josephine 

 Co., Sept. 5, 1916, J. R. Weir, 259. 



This species in all its stages is very common in western Oregon 

 and the association of the infected aecial and telial hosts is ever>^vhere 

 apparent. 



From field observations made by the writer and others it has 

 been assumed that Peridermium pseiido-halsameiim was the aecial 

 stage of this species. Recently Weir and Hubert (Am. Jour. Bot. 

 4: 328-332. 191 7) have conducted cultures showing the genetic con- 

 nection of this species with aecia on Abies grandis. The authors 

 evidently do not consider the aecia identical with P. pseudo-balsameum. 

 The description which they give, however, agrees very well with the 

 type of that species. 



According to the writer's present interpretation, there are two 

 closely related species of Peridermium on Abies grandis in western 

 Oregon. One is to be referred to P. balsamenm and is presumably 

 genetically connected with Uredinopsis Copelandii (cf. 31). The 

 other is P. pseudo-balsameum and is genetically connected with the 

 species under discussion. 



The walls of the aeciospores in P. balsameum are considerably 

 thinner than those of P. pseudo-balsameum. In the former they are 

 1-1.5 (X while in the latter they are 2-2.5 M in thickness. 



PUCCINIACEAE 



33. Earlea speciosa (Fr.) Arth. Result Sci. Congr. Bot. Vienne 341. 

 1906. 



Aregma speciosa Fr. Syst. Myc. 3: 496, 1832. 



Phragmidium speciosum Coo\iQ, GrQ.v\\\e3t. z: 171. 1875. 

 On. Rosaceae: 



Rosa gymnocarpa Nutt.? — I, Austin, Grant Co., Aug. 1915, J. R. 

 Weir, 188. 



