DK.SCRIPriON OF AMERICAN I'REDINK.E. 



51 



Mostly h\'poph}llous, but occasionally with minute sori on 

 the spots on the upper surface of the leaf; spots brown to 

 black, sometimes surrounded by a yellow margin; sori mostly 

 clustered in spots or patches, which are frequently sur- 

 rounded b\' yellow rings: spores smooth, oblong, evidently 

 constricted; apex slightly thickened and rounded, or much 

 more thickened and beak-Hke, 15-20 bv 36 52// (mostly 16 

 to 44// ) ; pedicel slightly colored, usualh' shorter than the 

 spore. Plate II., Figs. loa. lob, loc. 



Common. Probably occurs wherever the host is abundant. 



Exsic. Ellis. N. A. F. 264. Rabenhorst-Winter. Fungi 

 Europa'i, 3124. 



Thuem. Mycotheca Univ. 33. Seymour and Earl, Econ. 

 Fungi, 322a and 322b. Carleton, Ured. Am. 34. 



Also occurs on species of Ambrosia. Ellis, N. A. F. 1853. 



II. PucciNiA ASTERis Diiby. (1830. Botiiu. GulL 2, p. 888. ) 

 I la. On Aster niacrophyUiis L., Bayheld, Wise. Hohvay. 

 lib. On Aster chainissouis Gra^-, Berkeley, Calif.. Bias- 

 dale. 



lie. On Seiiecio sp.. Ann x\rbor. Mich.. Ilolivay. 

 On our labels this date is given as 1828, but the second 



part of Bota)i. Gall, was not published until 1830. 



Oric;. Dkslr. "17. P. asteris (Dub. mss.) maculis supra lutescL'iilibus, 

 acer\ ulis magnis fuscis orbicularibus elongatisque convexis, coin- 

 pactis pulvinatisque, sparsis. hypopbvllis epidermide rupta cincti>.: 

 stipite albo, filiformi; sporidiuni elongato-ellipticum medio con- 

 Ntrictum subiequante, articulo inferiori elongato-turbinato, superi- 

 ori obtu-;o, elliptico aut ovato-globoso. Ad Asterum salignuni in 

 agro Lezurenzi detexit eel. Frost."' 



Mostly h3-poph3-llous. Spots often yellow, or stained with 

 red, purple, or brown; sori sometimes scattered and distinct, 

 or crowded or confluent, brown or black, surrounded by the 

 ruptured epidermis; spores clavate, gradually narrowed to the 

 septum and tow^ard the base; upper segment broadest; apex 

 much thickened, rounded, or pointed, 12-20 b}- 32-52//: pedi- 

 cel nearly hyaline, usually somewhat shorter than the spore. 

 A variable species. Plate II., Figs. iia. iib, iic. 



