Garrett : Smuts and Rusts of Utah 



203 



14. UsTiLAGo striaeformis (Wcstend. ) Niessl. 



A collection of this species from Utah on Phleum pratense L. 

 is listed in North American Flora 7^ : 19. 1906. 



UREDINALES 



2. Aecidium Tithymali Arthur, Bull. Torrey Club 45: 151. 



1918 



This rust was called Aecidiuju Euphorbia Pers. in the first 

 paper on the " Smuts and Rusts of Utah." It has now been 

 decided that the true Aecidium Euphorhiae does not occur in 

 America. From field observations made at Cimarron, Colorado, 

 the latter part of July, 1918, the writer feels confident that A. 

 Tithymali is the aecial stage of Uromyccs occidentalis. This was 

 the only aecium found in the locality. Wherever it occurred, the 

 Uromyces (on Eupinus Greenci A. Nels. ?) was very abundant. 

 There was not one center of infection, but several, and they were 

 several hundred yards apart. Moreover, the Aecidium Tithymali 

 was for the most part too old to make good specimens, while the 

 Uromyces was in prime condition. 



4. PucciNiA MONOiCA (Peck) Arth. I 

 Aecidium monoicum Peck. 



Another collection was made in the summer of 191 5 of the 

 Aecidium on Sophia sp. (since determined as v9. leptostylis 

 Rydb.), referred to in previous papers of this series (Mycologia 

 2: 271. 1910, and Mycologia 6: 241. 1914) as No. 4 {Aecidium 

 monoicum) . The collection in the summer of 191 5 was made in 

 Big Cottonwood Canyon not far from the place where the original 

 collection was made. 



On Schoenocrambe linifolia (Nutt.) Greene (Sisymbrium lini- 

 folium Nutt.). Collected by Professor Marcus E. Jones, May 25, 

 1908, at White River, Uinta Co., alt. 1800 m. (No. 7787 Jones.) 



7. PucciNiA alternans Arth. Ill 



On Bromus sp. : 22g2a, July 12, 1915, near Silver Lake, Big 

 Cottonwood Canyon, alt. about 2615 m. This was weathered 



