30 • Arthur : New species of Uredineae 



Fungi Columbiani, no. 1724) ; Newton, Mass., without date, W. 

 G. Far low (in Ellis, North American Fungi, no. 285) ; Myrica 

 Gale L., Orono, Me., Oct. 12, 1900, P. L. Richer (in Ellis & Ever- 

 hart, Fungi Columbiani, no. 14.82). 



The much thickened inner walls of the uredinial peridium and 

 the thin-walled teliospores especially distinguish this species. It 

 has been reported on the first named species from North Carolina, 

 New York, and Vermont, in addition to the above data. 



Hyalopsora pellaeicola sp. nov. 



II. Uredinia amphigenous, scattered, irregularly round or ob- 

 long, bullate, 0.3-0.7 mm across, dehiscent by apical rupture, soon 

 naked, pulverulent, golden-yellow, ruptured epidermis noticeable, 

 peridia very delicate and difficult to detect ; urediniospores globoid 

 or obovate-globoid, 17-22 by 23-30//, wall colorless, thin, ifi % 

 usually appearing twice as thick, minutely verrucose, or even 

 echinulate-verrucose, pores obscure, equatorial. 



III. Telia unknown. 



On Pellaea andromedac folia (Kaulf.) Fee, San Gabriel Canon, 

 Los Angeles County, California, March 13, 1903, LeRoy Abrams 

 3125 (type); Cryptogramme Stelleri '{Gmel.) Prantl, {Pellaea gra- 

 cilis Hook.), Red Rock, Michigan, June 28, 1884, J* Maconn 

 (host determined by L. M. Underwood), and Decorah, Iowa, 

 August 1882, E. W. D. Hohvay. 



The large globoid and very thin-walled urediniospores sharply 

 distinguish this species from those on Phegopteris and Cys top ten's . 



CERATELIUM gen. nov. 



Pycnia and aecia unknown. Uredinia with peridium, centrally 

 dehiscent, urediniospores borne singly on pedicels, wall nearly 

 colorless, echinulate, pores obscure, contents colored. Telia with 

 spores united into a short column, or globoid mass, arising at first 

 from bed of the uredinia, waxy ; teliospores one-celled, wall 

 smooth, nearly or quite colorless. 



Ceratelium Canavaliae sp. nov. 



II. Uredinia hypophyllous, gregarious on reddish-brown spots, 

 crowded, small, 0.1-0.2 mm. across, bullate, rupturedepidermis 

 inconspicuous, centrally dehiscent ; peridia delicate, cells polyg- 

 onal, inner walls slightly if any thicker than the outer walls ; 

 urediniospores broadly ellipsoid or globoid, 18-23 by 26-34/* ; 



