77 
NEW NORTH AMERICAN UREDINEA. 
By P. Dreret. 
Heidium Blasdaleanum, D. & H. Spots yellow, red- 
dish or brown. Aicidia consociated in groups of very 
different size, hypophyllous and on the young fruits, causing 
swellings on the latter and on the principal veins of the 
leaves. Pseudoperidia short, with torn white edges, decay- 
ing. Peridial cells irregularly rounded, verrucose, easily 
separating. Aucidiospores elliptical, polygonal or globose, 
18-21 x 17-194, verrucose, membrane colorless. 
On Crategus rivularis and Amelanchier  alnifolia. 
Shasta Springs, Siskyou Co., Cal. Aug., 1894, leg. W. C. 
Blasdale. 
This is a true Au’cidium and does not belong to the genus 
Roestelia comprising the ecidial stages of Gymnosporan- 
gium. In the present specimens on Crategus rivularis 
the leaves are attacked, on Amelanchier alnifolia principally 
the young fruits. 
Keidium Tonelle, D. & H. Hypophyllous, pseudo- 
peridia crowded, short, cup-shaped, edges recurved, white, 
minutely toothed. Spores roundish or oblong, finely verru- 
cose, 17-20 x 17-184, membrane colorless. Spermogonia 
hypoyphyllous, scattered. 
On Collinsia tenella, W. Klickitat Co., Wash., April 29, 
1894, leg. W. N. Suksdorf. 
From Aicidium pentstemoniatum, Schw.; this species differ 
by the distribution of the spermogonia and by not causing 
spots. 
Uromyces Suksdorfii, D. & H. Sori amphigenous, 
scattered, minute, dark brown, pulverulent. Uredospores 
elliptical, densely verrucose, brown, 25-28 x 18-20u. Teleu- 
tospores elliptical, obovate or spherical, golden-brown, 
coarsely verrucose, apex hooded, 25-32 x 23-254. Pedicels 
short, decaying. 
On Silene Oregana. W. Klickitat Co., Wash., July 17, 
1894, leg. W. N. Suksdorf. 
