AMERICAN UREDINE^E. 179 



The published descriptions of P. clavispora and P. 

 virgata also agree, except that in the latter the teleuto- 

 spores are said to be "sometimes a little roughened." 

 This can only be explained by supposing the statement to 

 apply to the uredospores, which occur sparingly in the 

 original material, and being colored like the teleutospores 

 and of the same apical form, might easily be mistaken for 

 them. So far as we know Puccinia virgata occurs only on 

 Chrysopogon avcnaceus (Michx.) Benth. {Sorghum nutans 

 Gray, Andropogon avenaceus Michx.). 



38. Puccinia ELLisiANA Thuem . (1878. Bull. Torr. Bot. 

 Club. 6:215). 



38a. On Andropogon scoparius Michx. III. Rooks Co., Kans., Bar- 

 tholomew. • 

 38£. On Andropogon scoparius ii, III. Decorah, Iowa, Holway. 



Orig. Desc. "P. acervulis hypophyllis, gregariis, plus minusve 

 lineariformibus, seriatis, elevatis, atro-fuscis, liberis; sporis ellip- 

 soideis vel subclavato-ellipticis, septatis, medio vix constrictis, 

 vertice rotundatis, incrassatis,apice rotundatis,ab pedicello separa- 

 tis, episporio disseptimentoque crasso, obscuriore, 30-40 mm. long - ., 

 18-23 mm. crass., fuscis; pedicello subrecto, a^quali, 18-22 mm. 

 longo, pallidissime fusco; paraphysibus nullis — Certe a P. 

 andropogonis, Fckl., diversa." 



New Jersey: Newfield, in Andropogonis virginiani Lin., foliis 

 aridis, Jan.. 1877. Eeg. J. B. Ellis." 



SYN : 



1895. Puccinia andropogi Lagerheim (non Schw.) 

 Ured. Herb. Fries :45. 



1898. Diccsoma ellisianum Kuntze, Rev. Gen. PI. 3:468. 



Sori as in P. andropogonis Schw. Uredospores yellowish- 

 brown, thick-walled, (about 4/"-), closely and finely tuber- 

 culate, subglobose, 16-24/"*, mostly 20^ in diameter, pores 

 four, equatorial, distinct: teleutospores elliptical to oblong 

 or clavate, averaging larger than those of P. andropogonis, 

 the elliptical ones 20-24 by 32-40^, and others 16-20 by 



