186 NATURAL HISTORY BULLETIN. 



slightly roughened, only moderately thickened at apex, which is 

 regularly rounded or sometimes flattened, without any distinct 

 papilla, very faintly striate, 27-52 by 19-23//, on stout, short, (15-20,u) 

 slightly colored pedicels. Sori mostly oblong and about 1mm. 

 long, covered by the epidermis, which finally splits either along 

 the top of the sorus, or oftener along one side, leaving it covered as 

 if by a cap or lid. 



Differs from Puccinia paspali Tracy & Earle in the shape of the 

 sori, the slightly echinulate uredospores and the thick, short 

 pedicels of the teleutospores." 



Sori amphigenous, oblong, small, at first bulliform then 

 tardily naked; ruptured epidermis prominent, sometimes 

 stretched over the sorus in bands. 



II. Sorus pale yellow; uredospores obovate or globose, 

 19-24 by 20-30u; wall rather thin, yellowish-brown, finely 

 and abundantly echinulate; pores four, equatorial. 



III. Sorus brown; teleutospores oblong or obovate , dark 

 brown, 19-24 by 28-50/".; apex more or less thickened, 

 rounded, obtuse or slightly truncate; pedicel somewhat 

 colored, firm, from short to the length of the spore or 

 longer. 



Exsic : 

 Sydow, Uredineen 1080. 



This appears to be a polymorphous species. The 

 Kansas collections upon Paspalam setacenm have teleuto- 

 spores with mostly broad and short pedicels, while the 

 Mexican collections on Pennisctum mcxicanum have most- 

 ly broad and long pedicels ; otherwise the two forms appear 

 essentially alike. But the form on Paspalum paniculatum, 

 on the contrary, has smaller and more delicate spores 

 of both uredo stage and teleuto stage, and the teleutospores 

 are quite irregularly shaped, with short and more slender 

 pedicels, which are sometimes attached obliquely. 



Comparing this material with the type collection of 

 Puccinia paspali Tracy & Earle, which was secured at 

 New Orleans, La., upon Paspalum virgatum L,., one is 

 struck with the lack of distinctive characters. The 

 uredospores of Puccinia paspali are like those on Paspalum 



