OF ARTS AND SCIENCES. 77 



which are more frequent toward the end of the season, are short- 

 stalked, ovate, with a distinct hyaline papilla at the npex, and are 

 marked witli spiral lines or dots arranged in spirals. This latter stage 

 is the Uredo Toxicodendri of Ravenel's Fung. Car. III., no. 797, 

 described by Berkeley in Grevillea, Vol. III. p. 5G, under the name 

 of Uromyces Toxicodendri. It seems to me that Leveille and Tulasne 

 were ri<rht in considerins; that Fileolaria is not distinct from Uromyces. 

 The same view is adopted by Winter, by whom, however, in the 

 Euro{)ean species, P. Terebinlhi Cast., the depressed globose spores 

 are considered to be the teleutospores, and not the uredo stage. The 

 Californian form on R. diversiloba seems to me the same as that found 

 on E. Toxicodendron in the East. A second species, P. ejfnsa, has 

 been described by Peck on species of Phus from Arizona. Inasmuch 

 as the P. brevipes and U. Toxicodendri were both distributed first in 

 Ravenel's Fung. Car. Sup. in 1855, it seems to me that, assuming the 

 funo-us to be a Uromyces, the name to be adopted by preference is 

 U. Toxicodendri Berk. & Rav. 



Nos. 23'J and 240. The species of Uromyces growing on Graminece 

 are especially perplexing in this country. The two numbers here 

 distributed are forms mentioned in the Bussey Bulletin, Vol. II. 

 p. 243, that on Spartina being considered to be probably a variety of 

 U. Junci. Since then I have been able to examine more fully the 

 various forms of U. Junci, and must now consider that the form on 

 Spartina is distinct. The teleutospores resemble strongly those of 

 U. Junci (Schw.) Tub, but the uredo spores are larger and differently 

 colored, so that the species is easily recognized when they are 

 present. 



Ukomyces Spartix^ Farlow. Sori long and narrow, soon naked. 

 Uredo spores orange-colored, long-stalked, globose or somewhat ellip- 

 tical, 25-34fA in diam., average 30/i., echinulate. Teleutospores 

 smooth, dark brown, long-stalked, 26-32/^ by 15-19/x, ovate, narrowed 

 at the base, apex acute or rarely truncate, with a thick wall. 



On Spartina stricta, submerged at high tide. Wood's IIoll, Mass. 

 July and later. 



As yet I have only seen this species at Wood's Holl, but it is to be 

 expected anywhere on the New England coast. The only JEcidia 

 seen growing near this species were those on Xanthium and Slatice, 

 which can hardly be supposed to have any connection with the present 

 Uromyces, as they are accompanied by P2(cct7iia Xanthii and Lro- 

 myces Limonii respectively. In the description I have said nothing 

 about paraphyses, although the teleutospores are mixed with hyaline 



