126 Rhodora [JUNE 
episporio cinnamomeo-brunneo, ca. 1.5-2 y crasso, distincte echinu- 
lato; poris germinationis 4 aequatoriali- 
bus instructis. 
7 palin i A 
l'eliis plerumque hypophyllis, sparsis, 
i H : oblongis v. linearibus, 0.5-2 mm. longo, 
epidermide diu tectis, pulvinatis, atro- 
brunneis; teliosporis obovatis v. oblongo- 
ratis a0 9 Q . ist 1 
Fig. 2. Two urediniospores of obovatis, 16-23 X 26-39 fs episSporio 
Uromyces valens showing the casteneo-brunneo, ca. 1.5-2 || crasso, 
four equatorial pores. apice incrassato (7-9 y), levi. 
Hab. in foliis Carieis urtriculatae, 
Mattsville, Indiana, Aug. 8, 1905, Guy West Wilson, 5130. 
The following key based entirely on uredinial characters will serve 
to show how the present described American species of Uromyces on 
Carex may be identified. 
Germ-pores equatorial. 
Germ-pores 4, urediniospores medium large, wall cinnamon-brown. 
U. valens Kern 
Germ-pores 2 (occasionally 3). 
Urediniospores medium large (15-19 X 19-26 x). 
Wall light cinnamon-brown, finely verrucose-echinulate. 
U. Solidaginis-caricis Arth. 
Wall golden-brown, coarsely and sparsely echinulate. 
U. caricina E. & E. 
Urediniospores small (10-15 x 15-19 54), wall golden-brown. 
U. minutus Diet. 
Germ-pores extra-equatorial. 
Germ-pores 2, superequatorial, wall cinnamon-brown. U. perigynius Hals. 
Germ-pores 1, below, near the hilum, wall dark cinnamon-brown. 
U. uniporulus Kern. 
Uromyces Solidaginis-caricis has been reported from Nova Scotia 
and Maine to Indiana and Wisconsin, and in Colorado. The telial 
hosts at present known are Carex deflexa, C. flava, C. gracillima, 
C. lanuginosa, and C. pubescens. Cultures of this species have been 
made showing its aecial stage to be on species of Solidago. The aecia 
have been collected in Maine on Solidago rugosa and in Indiana on an 
undetermined Solidago. U. caricina is known only on Carex scoparia 
from Delaware and New York. U. minutus is a southern species 
found along the gulf coast from Florida to Texas. Carex triceps is the 
only determined host upon which it has been found. U. perigynius 
is a little known species which has been collected only twice, once in 
Iowa and once in Wisconsin. Both collections are on Carex in- 
tumescens. U. uniporulus is known only from the type locality in 
New England. Uromyces valens occurs on Carex lupulina in addition 
