264 BROOKLYN BOTANIC GARDEN MEMOIRS 



In America the most important work has been conducted by 

 Carleton (Div. Veg. Phys. & Path. U. S. D. A. Bull. i6. 1899; Bur. 

 PI. Industry, U. S. D. A. Bull. 63. 1904); Arthur (Jour. Myc. 8: 53. 

 1902; 11:57. 1905; 12:17. 1906; 13:198. 1907; 14:16. 1908; 

 Mycol. 2: 227. 1910; 4: 18. 1912); Freeman & Johnson (Bur. PI. 

 Ind. U. S. D. A. Bull. 216. 191 1); Stakman (Minn. Exp. Sta. Bull. 

 138. 1914; Jour. Agr. Research 4: 193-199. 1915) and Stakman 

 and Piemeisel (Jour. Agr. Research 6: 813-816. 1916; 10: 429-495. 

 1917). 



In Oregon the rust is apparently not as important on wheat and 

 other grains as it is in the spring wheat districts east of the Rocky 

 mountains. No aecial collections have been made. 



A number of unrecorded hosts appear in the above list. Since 

 the publication of Uredo quinqueporula by Arthur and Fromme (1. c), 

 telia have been found on a duplicate specimen which determines that 

 that species is properly referred here. The number of pores in the 

 uredospores of that collection is unusual for this rust, the usual number 

 being 4, and in the absence of telia was considered of sufificient impor- 

 tance to separate it as a distinct species. 



152. PucciNiA PoLYGONi-ALPiNi Cruchet & Mayor, Bull. Herb. Bois 



8: 245. 1908. 

 On Polygonaceae: 



Rumex paucifolius Nutt. — Crater Lake, Klamath Co., Sept. 9, 

 191 6, J. R. Weir, 233. 



This specimen is referred to the above species on account of the 

 hyaline umbo covering the pore of the apical cell in the teliospore. 

 The species is described from material on Polygonum alpinum from 

 Europe with which our material closely agrees. A collection on that 

 host from Idaho is also to be referred here. The rust is unlike any 

 other recorded on Rumex. The only other collection recorded on this 

 host from North America is the one on which P. uniformis Pammel & 

 Hume from Wyoming was based, which Holway (N. Am. Ured. i : 36. 

 1906) considers to be on Polygonum sp. and refers to P. Bistortae. 



153. PucciNiA PoLYGONi-AMPHiBii Pcrs. Syn. Fung. 227. 1801. 

 Aecidium Geranii maculati Schw. Schr. Nat. Ges. Leipzig i: 67. 



1822. 

 On Polygonaceae: 



Polygonum amphibium L.- — Brandt's Ranch, Wallowa Valley, Aug. 

 26, 1897, E. P. Sheldon, 8g72; The Dalles, Wasco Co., Aug. 25, 1915, 

 E. Bartholomew (Barth. N. Am. Ured. 1566); 



Polygonum MuhlenbergiiS. Wats. (P. emersum Britt.) — The Dalles, 

 Wasco Co., Aug. 26, 1915, E. Bartholomew (Barth. Fungi Columb. 



