JACKSON: UREDINALES OF OREGON 245 
Puccinia Poarum Niels. Bot. Tidsskr. II. 3: 26. 1877. 
On POACEAE: 
Poa ampla Merrill—Hood River, May 14, 1914, 159TI. 
Poa annua L.—Hood River, July 22, 1915, 31906. 
Poa macrantha Vasey—Newport, Lincoln Co., June 20, 1915, 3123. 
Poa pratensis L.—Corvallis, May 19, 1913, F. D. Bailey, z194, 
March 29, 1914, G. B. Posey, 3126, April 29, 1914, F. D. Bailey, 
3125, June 29, 1914, G. B. Posey, 1311; Philomath, May 10, 1914, 
3124; Hood River, May 14, 1914, 1586, 1592; The Dalles, Wasco 
Go.,-)uly: 1, ror, 7302; 'N. slope .Mt.. Hood, “Aug. 7; 1954; 1557; 
Ashland, Jackson Co., Sept. 10, 1914, 1565; Kamela, Union Co., 
July 22, 1915, M. E. Peck; Klamath Falls, Klamath Co., Sept. 8, 
1916, J. R. Weir, 224, 239. 
Poa triflora Gilib.—Klamath Falls, Klamath Co., Sept. 8, 1916, 
J. R. Weir, 239a. 
Poa sp.—Grant’s Pass, Josephine Co., Sept. 3, 1916, J. R. Weir, 
228, 229; Klamath Falls, Klamath Co., Sept. 8, 1916, J. R. Weir, 
218; Austin, Grant Co., Aug. 1915, J. R. Weir, 194. 
This rust is especially common in western Oregon particularly on 
blue grass. Only uredinia are known in the above collections as is 
the common condition except in those made in the far north or at 
high elevations. 
Nielsen (Bot. Tidsskr. 2: 26. 1877) was the first to show the 
relation between this rust and Aecidium Tussilaginis Gmel. He suc- 
ceeded in infecting P. annua, P. trivialis, P. nemoralis, P. fertilis and 
P. pratensis by sowing aeciospores from Tussilago farfara. He in- 
fected the aecial host by sowing with teliospores from P. annua. 
Additional observations and culture work have been recorded by 
various European authors, which have been summarized by Klebahn 
(Die Wirtsw. Rostp. 290. 1904). 
101. PuccINIA ERIOPHORI Thiim. Bull. Soc. Imp. Nat. Moscow 55: 
208. 1880. 
Aecidium Ligulariae Thiim. Nov. Giorn. Bot. Ital. 12: 196. 1880. 
Aecidium Cinerariae Rostr. Overs. Kong. Dansk. Vid. Selsk. Forh. 
Koph. 1884-5: 17. 1884. 
On CARDUACEAE: I. 
Senecio ductaris Piper—Alpine meadow, E. Mt. Hood, 5,000 ft., 
July 23, 1915, 3320. 
ON CYPERACEAE: III. 
Eriophorum polystachyon L.—Alpine meadow, E. Mt. Hood, 5,000 
SE, July-23- 1015, 7327- 
In the alpine meadow where the above collections were made the 
Aecidium was very abundant and in fine condition. A search was 
