130 NATURAL HISTORY BULLETIN. 



44-52/* ; apex thickened, rounded or often pointed in the 

 oblong-clavate ones; pedicel nearly hyaline, frequently up 

 to 80/"* long. 



EXSic : 

 Thuemen; Myc. Univ. 1336. 



That two species of rusts have been confounded under 

 the name of Piiccinia andropogi was first pointed out by 

 Eagerheim in his account of the UredinecF in the herbarium 

 of Elias Fries, now in the Botanical Museum of the 

 University of Upsala, Sweden. He was unfortunate, how- 

 ever, in assuming that the species having thick-walled 

 uredospores was the true Schweinitzian P. andropogi. 



The writers have not examined the type specimens of 

 Piiccinia cl/isiana, but the examination of specimens in 

 three sets of Thuemen's "Mycotheca universalis," viz., 

 those in possession of the' New York Botanical Gardens, of 

 De Pauw University, and of Mr. Holway, which apparently 

 contain part of the type collection, uniformly shows the 

 presence of the characteristic uredospores. It is possible, 

 however, that some of the following species may be inter- 

 mixed, as is likely to be the case in almost any collection 

 of this rust. It is doubtful if the host of the type collec- 

 tion, which w r as taken in mid-winter, is really Andropogon 

 virgin icns, as published, for the ligules of the leaves in 

 specimens available are broad, entire, or slightly jagged, 

 and correspond with those of Andropogon glomcratus, a 

 species which grows in the type locality, instead of being 

 narrow and ciliate, as in A. virginicus. But this is not a 

 matter of moment as the species occurs upon A.scoparius, 

 A. furcatus, and probably upon other native species of 

 Andropogon, and might well occur on A. virginicus. The 

 specimen in Ellis & Everhart's "Fungi Columbiana," No. 

 1376, on Andropogon /ia//ii, is Piiccinia andropogonis, 

 and not P. ellisiana as labelled. The species doubtless 

 ranges throughout the central and eastern United States, 

 for specimens have been examined from different localities 



