Arthur : New species of Uredjneae 515 



type) ; Armstrong, Iowa, July 17, and August, 1886, R. I. Crafty ; 

 Rooks County, Kansas, December 7, 1894, E. Bartholomew ; 

 Racine, Wisconsin, October 27, 1901, /. /. Davis; Spirit Lake, 

 Iowa, April 7, 1902, /. C. Arthur ; Stockton, Kansas, March 7, 

 1906, E. Bartholomezv. This rust has been known for some time, 

 and has been listed under Uromyces Junci. It differs from that 

 species, however, in a number of inconspicuous but positive char- 



acters. 



/* 



brought about by longitudinal slitting of the overlying epidermis, 

 and not by falling away of the epidermis, while the urediniospores 

 are more inclined to oblong, with thinner walls, and a wholly un- 

 like arrangement of the germ-pores. The teliospores are much 

 alike in both species. When Eleocharis and Juncus stems are de- 

 prived of their upper and lower portions, as in most cryptogamic 

 collections, they are quite similar in appearance, and not infre- 

 quently misnamed. They can be distinguished, however, by a 

 cross-section of the stem, which in Juncus will show a rather uni- 

 form central pith, and in Eleocharis a number of large lacunae. 



Uromyces insularis sp. nov. 



II. Uredinia amphigenous, scattered, small, round, 0.1-0.4 

 mm. across, soon naked, dark cinnamon-brown, ruptured epidermis 

 noticeable ; urediniospores globoid, 19-23 by 23-25 /i, wall golden- 

 brown, 1-1.5 /i thick, sparsely echinulate with conical points about 



3 (i apart ; pores 3, equatorial. 



III. Telia amphigenous, scattered or oval, 0.2-0.8 mm. across, 

 soon naked, light cinnamon-brown, ruptured epidermis noticeable ; 

 teliospores broadly lanceolate, rounded or obtuse at both ends, 

 15-18 by 29-39 /a wa ^ golden-yellow, thin, about 1 //, apex 

 usually bearing a hyaline umbo, 3-7 ft thick; pedicel hyaline, 

 short, deciduous. 



On Clitoria cajanifolia (Presl) Benth., near Dorado, Porto Rico, 

 May 19, 1887, /. Urban. This species was found on sheet no. 

 8°339 °f the phanerogamic herbarium of the Field Columbian 

 Museum. Thanks are due the officers of the Museum for their 

 kindness in permitting the writer to examine the collection for 

 rusts. The species is very unlike Uromyces Clitoriae Arth., from 

 Mexico, which has ellipsoid teliospores with thick, verrucose 

 walls. 



