320 NATURAL HISTORY BULLETIN. 



teleutospores measuring 16-20 by 30-48/1, and the uredo- 

 spores average about 20/a in diameter. The gross appear- 

 ance of the fungus does not vary much, and the microscopic 

 appearance, except for size, is also quite uniform. 



The material of number 51^ of the accompanying distribu- 

 tion is part of the same collection as that distributed by Sydow 

 in his Uredineen No. 910, and both are of the type collection. 

 An error occurs on the label of the Sydow exsiccatas: the 

 host is given as Calamagrostis Canadensis, but is in reality 

 Calamovilfa longifolia, as any one may convince himself by 

 examining the fragments of inflorescence that accompany the 

 specimens. Number 51$ is also a collection from the type 

 locality. 



The species resembles Puc. -poculiformis in its teleutospores, 

 but is easily distinguished by the uredospores, both by their 

 form and the number and arrangement of their pores. 



52. Uromyces acuminatus Artk. (1883, May. Bull. Minn. 

 Acad. Sci. 2: 35.) 



52a. On Spartina cynosuroid.es (L.) Willd., II. iii, Spirit Lake, Iowa, 

 Arthur. 



52b. On Spartina cynosuroides (L.) Willd., Ill, Decorah, Iowa, Hohvay. 



52c. On Spartina cynosuroides (L.) Willd., Ill, Spirit Lake, Iowa, 

 Arthur. 



52J. On Spartina cynosuroides (L.) Willd., Ill, Fargo, N. D., Bolley. 



Orig. Descr. "I. Unknown. II and III. Sori linear, narrow, elongated, 

 on the under surface of the leaves, plane or slightly convex, sunken, 

 soon naked; encircling epidermis somewhat conspicuous. II. Ure- 

 dosori yellowish, inconspicuous; uredospores large, round or elliptical, 

 finely and plentifully echinulate, brownish yellow, 22 to 30/z broad by 

 26 to 35« long. III. Teleutosporesori brownish-black; teleutospores 

 oblong-club-shape and oblong-lanceolate to obovate, smooth, golden- 

 brown, darker at the apex, 15 to 22// broad by 25 to 42/x long; wall thin; 

 apex much thickened, 8 to 12/i thick, more or less obliquely acuminate, 

 or rarely only apiculate, sometimes with two pointed terminations, one 

 longer than the other, very rarely obtuse or rounded, base narrowed or 

 only acute; pedicel of uniform thickness, as long as the spore, or shorter, 

 very rarely longer, colored." 



