JACKSON: UREDINALES OF OREGON 213 



Melampsorella Cerastii (Pers.) Schroet. Krypt. Flor. Schles. 3': 

 366. 1887. 

 On Pinaceae: I. 



Ahies grandis Lindl. — Mary's River, west of Wren, Benton Co., 

 Aug. 2, 1914, I2Q'/; Sumpter, Baker Co., July 20, 1913, J. R. Weir, 

 2/6. 



Abies lasiocarpa (Hook.) Nutt. — Crater Lake, Klamath Co., 

 Sept. 9, 1916, J. R. Weir, 20Q; Sumpter, Baker Co., July, 1913, J. R. 

 Weir, 274. 

 On Caryophyllaceae : II, III. 



Cerastium vulgatum L. — Corvallis, May i, 191 5, 2667. 



Cerastium viscosum L. — Corvallis, June 28, 1915, 301Q. 



Stellaria horealis Bigel. — Corvallis, April 5, 1914, 1287. 



This rust, which is doubtless common throughout the state, is 

 remarkable in that both stages develop from a perennial mycelium. 

 The aecial stage forms large or small witches' brooms on the branches 

 of various species of Ahies, each leaf of which bears the conspicuous 

 aecia in two rows on the under surface of the leaves. 



The life history was first worked out by Fischer (Zeitschr. fiir 

 Pflanzenkr. 11 : 321. 1901) and has been amply confirmed by other 

 European investigators. A summary of this work has been made by 

 Klebahn (Die Wirtsw. Rostpilze 397. 1904). 



In America Arthur (Mycol. 4:58. 1912), using aecial material on 

 Ahies lasiocarpa collected in Colorado, has succeeded in obtaining 

 infection resulting in uredinia on Cerastium oreophilum. 



21. Melampsoropsis Piperiana Arthur, N. Amer. Flora 7: 120. 



1907. 

 On Ericaceae: 



Rhododendron Calijornicum Hook. — Newport, Lincoln Co., June 

 2, 1892, A. Isabel Mulford (Specimen in Herb. N. Y. Bot. Card, and 

 in Herb. J. C. Arthur), May 16, 1914, G. H. Godfrey, 1280; Larch 

 Mt., Multnomah Co., Aug. 1910, 1118; Parmelia Lake, near Mt. 

 Jefferson, July 3, 1914, F. D. Bailey, 1939; Trail to Hanging Valley, 

 near Mt. Jefferson, Aug. 11, 1914, H. P. Barss & G. B. Posey, 1623. 



22. Melampsoropsis Pyrolae (DC.) Arth. Result Sci. Congr. Bot. 



Vienne 338. 1906. 

 Aecidium (?) Pirolae DC. Fl. Fr. 6: 99. 1815. 

 Aecidium cononcm Piceae Reess, Abh. Nat. Ges. Halle 11: 102. 



1869. 

 ■ Chrysomyxa Pirolae Rostr. Bot. Centr. 5: 127. 1881. 

 Peridermium conoriim Piceae Arth. & Kern, Bull. Torrey Club 33: 



431. 1906. 



