Paros/f/c Fini(/i of J!//)iois. 185 



On leaves of Aiiibrosid fr/Jida : Mcljeaii, July 5, 2:iS;}, July 

 29, 2880, Au^^ 4, 2384; Cliiinipaif<ii, Aug. 12, WMr, Piatt, Aug. 

 17, 1](H); Fulton, Oct. 8, 1784. Xanthinm stnniKd'iuin : Mc- 

 Lean, July 4, 2887, July (>, 2887, July 11, 2888, July 14. 5588; 

 July 29, 2385, Oct. 6, 1790; Tazewell, July 22, 2880; Cham- 

 paign, Aug. 13, 1041; Piatt, Aug. 17, 1128; McHenry, Aug. 

 22, 1205; Lee, Sept. 8, 5719: LaSalle, June 19, 5230, Sept. 12, 

 1477; JoDaviess, Sept. 18, 5985; Rock Island, Sept. 21, 1611; 

 Union, Oct. 21, 1932, Oct. 25, 1998 and 2004; Pulaski, Nov. 4, 

 2249. 



In the specimens on Ambrosia the spores are somev^^hat 

 thinner walled and more rounded than in those on XanfJiiion, 

 but the difference is slight. 



P. tanaceti, DC. 



ir.. III. Amphigenous. Sori mostly rather large, scat- 

 tered, often sprinkled over the entire leaf; uredospores globose 

 to ovate, echinulate, 21-24 by 27-32 /t; teleutospores variable, 

 broadly oblong to broadly oval with rounded ends, usually lit- 

 tle constricted, smooth, or sometimes warty towards the apex, 

 the latter thickened or not, 21-27 by 84 -60 ix ; pedicel hyaline, 

 A'ery long, two to four times the length of the spore. 



On leaves of HeJiantkns anninis: Piatt, Aug. 10, 1006; 

 Lake, Aug. 22, 1206, I., II.: Kane, Aug. 80, 1866, I., II.; Cook, 

 Sept. 8, 1468, I., II.; Rock Island, Sept. 27, 1601. H. rirjidus: 

 McLean, July 26, 2297, Oct. 11, 1881; Piatt, Aug. 10,1004; 

 LaSalle, Sept. 12, 1491, Sept. 14, 1539, Sept. 16, 1557, Sept. 20, 

 1598. H. mollis: Marion, Oct. 20, 1902. //. decapetalus: Mc- 

 Lean, Aug. 4, 2299, Oct. 6, 1799. Helianthns sps.: Adams, 

 June 30, 5361, II.; McLean, July 15, 2301, July 29, 2300, II., 

 III., Oct. 6, 1798, Oct. 7, 1822, Oct. 11, 1887, Oct. 18, 1871; 

 Champaign, Aug. 13, 1038; Piatt, Aug. 17, 1129; McHenry, 

 Sept. 20, 1160; Kane, Aug. 80, 1365; Cook, Sept. 5, 1437; Lee, 

 Sept. 11, 5784; LaSalle, Sept. 18, 1496, Sept. 14, 1541, Sept. 17, 

 1565; Stephenson, Sept. 13, 5835, II., III., 5844, IT., III.; Jo- 

 Daviess, Sept. 15, 5916, II., III.; Ogle, Sept. 23, 6146, III.; 

 Rock Island. Sept. 21, 1612, II., III., Sept. 26, 1665, Sept. 27, 

 1675; Henry, Sept. 28, 1723; Fulton, Oct. 1, 1766, Oct. 3, 1738; 

 Jersey, Oct. 18. 6291; Union, Oct. 21, 1904, Oct. 28, 2097. 



