282 BROOKLYN BOTANIC GARDEN MEMOIRS 



Nigredo proeminens Arth. N. Am. Flora 7: 259. 1912. 

 On Euphorbiaceae : 



Euphorbia glyptosperma Engelm. — Wasco Co., July 23, 1885, W. 

 N. Suksdorf (from Phan. spec, in N. Y. Bot. Card.). 



Euphorbia oregonensis Millsp. — Horse Creek Canyon, Wallowa 

 Co., May 20, 1897, E. P. Sheldon, 8115. 



205. Uromyces punctatus Schrot. Abh. Schles. Ges. 48: 10. 1870. 

 Nigredo punctata Arth. N. Am. Flora 7: 253. 1912. 



On Leguminosae : 



Astragalus Purshii Dougl.- — Austin, Grant Co., Aug. 191 5, J. R. 

 Weir, 2j6. 



The aecia of this species have been shown by European authors 

 to occur on Euphorbia cyparissias. No aecial collections have been 

 made in America. 



206. Uromyces Scirpi (Cast.) Burrill, Bot. Gaz. 9: 188. 1884. 

 Uredo Scirpi Cast. Cat. PI. Mars. 214. 1845. 



Nigredo Scirpi Arth. Result Sci. Congr. Bot. Vienne 344. 1906. 

 On Cyperaceae: 



Scirpus paludosus A. Nels.- — Waldport, Lincoln Co., Aug. 23, 

 1915, F. D. Bailey, JJ2J. 



This species was first shown by Dietel (Hedwigia 29: 149. 1890) 

 to have its aecia on Sium latifolium and Hippurus vulgaris. Other 

 investigators have added other Umbelliferous hosts to the list. 



In America Arthur (Jour. Myc. 13: 199. 1907; 14: 17. 1908; 

 Mycol. 1 : 237. 1909) has shown that Cicuta maculata is an aecial 

 host. Eraser (Mycol. 4: 178. 1912) has confirmed Arthur's work. 

 Aecia on other hosts are properly referred here on morphological 

 grounds. The species can doubtless be separated into a number of 

 biological forms when more extensive culture work has been conducted. 



207. Uromyces Silphii (Burrill) Arth. Jour. Myc. 13: 202. 1907. 

 Aecidium compositarum Silphii Burrill; DeToni in Sacc. Syll. 



Fung. 7: 798. 1888. 



Uromyces Junci-tenuis Sydow, Monog. Ured. 2: 289. 1910. 



Nigredo Silphii Arth. N. Am. Flora 7: 239. 1912. 

 On Juncaceae: 



Juncus occidentalis (Gov.) Wieg. — Corvallis, Aug. 10, 191 1, 1187, 

 June 24, 1914, F. D. Bailey, 1387, July 29, 1914, 1445; Philomath, 

 Jan. 6, 1914, 1108, May 10, 1914, 3393; Hood River, July 24, 1915, 

 3392 > 



Arthur (Jour. Myc. 13: 202. 1907; 14: 17. 1908) has shown that 

 this common species has its aecia on Silphium. Using telial material 

 on J. tenuis from Indiana, West Virginia and Nebraska, five successful 



