318 NATURAL HISTORY BULLETIN. 



EXSIC : 

 Ellis & Everhart, N. Am. Fungi, 1854, 2886. 

 Shear, Ellis &Everhart's Fungi Colunibiani, 1467. 

 Sydow, Uredineen, 1068, 1173. 



Rabenhorst-Pazschke, Fungi Europ. et extraeurop., 4220. 

 Griffiths, West Am. Fungi, 296. 



This species is rather common throughout the United 

 States east of the Rocky mountains. It has heretofore pass- 

 ed indifferently under the names of Puc. Windsorice and Puc. 

 dochmia. The former name belongs to a wholly different 

 species inhabiting Tricuspis [Triodid). The error was in- 

 troduced by Burrill in his Parasitic Fungi of Illinois, and has 

 been followed by De Toni in Saccardo's Sylloge fungorum 

 (7:664), Farlow and Seymour, Host Index of Fungi, page 

 152, and by many others. It is readily separated from the 

 true P. windsorice, from P. emaculata and many other gra- 

 mineous species by its small and delicate uredospores. 



There is, however, much resemblance between this species 

 and P. dochmia, both macroscopically and microscopically. 

 The most pronounced differences are the larger and more 

 echinulate uredospores, and the larger and differently shaped 

 teleutospores. Oblique septa in Puc. muhlenbcrgice are not 

 common, while in Puc. dochmia they are the rule. 



The uredosporic pores of this species are not readily count- 

 ed. They are usually without order, but occasionally four 

 are placed in the equatorial zone and one at the apex. 



The Uredo muhlenbcrgice Diet., found in Alabama, is 

 wholly distinct, having much larger spores and equatorial 

 pores. It is an isolated form more likely to belong to the 

 genus Uromyces, than to Puccinia. 



51. Puccinia amphigena Diet. (1895. Hedw. 34:291.) 



51a. On Calamovilfa longifolia (Hook.) Hack. ( Calamagrostis longi- 

 folia 77<?0£.), Ill, Chicago, 111., Arthur. 



51b. On Calamovilfa longifolia (Hook.) Hack., Ill, Chicago, 111., 

 Arthur. 



5ir. On Calamovilfa longifolia (Hook.) Hack., Ill, Bassett, Neb., 

 Bates. 



