New Species of Uredineae—lIl 
By J. C. ARTHUR 
The following species of Uredineae have come to light, for the 
most part, from material kindly sent me by various collectors and 
Students. In some cases they proved to be entirely unrepresented 
in my herbarium, but in other cases they had been known for 
some time, yet in too fragmentary condition to permit of descrip- 
tion. Collections of what appear to be common species but upon 
unusual hosts often prove, when studied in connection with large 
Series, to be new or otherwise interesting forms. Collections from 
Previously unexplored regions generally well repay careful study, 
even if at first sight they seem to contain nothing new. All the 
Species of this paper, except one from India, are from various 
Parts of the United States. Thanks are due and are hereby 
€xtended to the several persons who contributed the material 
herein cited, as well as other material used for comparison during 
the study, 
Uromyces Rickerianus sp. nov. 
I. Aecidia more hypophyllous than epiphyllous, in dense 
clusters ; substratum scarcely thickened ; peridia pale, low, erose ; 
aecidiospores globose to oblong, 16-22 x 18-26 w; wall thin, 
minutely verrucose, appearing smooth. 
III. Teleutosori at first intermixed with the aecidia, especially 
— the petioles, elliptical, reaching 4 mm. in length, long covered 
“id the delicate, gray epidermis, at length pulverulent, chocolate- 
ek teleutospores dark brown, globose to oblong, somewhat 
abl merr) 20-25 x 23-35 », wall medium thick, apex not notice- 
y thickened, both apex and base rounded, pedicel colorless, 
tagile, very short. 
On leaves of Rumex Geyeri (Meisn.) Trel., Teton Pass, Wy., 
July 13, 1901 (Elmer D. Merrill and E. N. Wilcox, no. 1217, 
somm. by P. L. Ricker). 
- ay aecidia of this species bear a striking resemblance to those 
Gait ccima phragmitis, but have a little thinner and smoother 
Sand are a trifle smaller ; the gross appearance is about the 
Saas The Species is named in recognition of the interest taken . 
227 
