1910] Kern,— New species of Uromyces 125 
A specimen of Uromyces on Carex debilis var. Rudget from Con- 
necticut has recently been studied which is very striking in the germ- 
pore character in that it has but one pore in a urediniospore. In this 
regard it is not only different from all other known Carex rusts, either 
Uromyces or Puccinia, but so far as the writer knows no species of 
rust (order Uredinales) has ever been observed, previously, with a 
single pore in the urediniospores. Phe location of the pore is also 
unusual being in the lower part of the spore near the hilum, the scar 
left by the fall of the pedicel. There are also other differentiating 
characters but on account of the very notable one of a single pore in 
the urediniospores a name has been selected. specially to distinguish 
it in that regard. It may be characterized as follows: 
Uromyces uniporulus n. sp. — Urediniis hypophyllis, sparsis, punc- 
tiformibus, 0.1-0.3 mm. diam., mox nudis, pulvinatis, dilute castanels; 
urediniosporis globosis v. subglobosis, 18-21 X 21-23 4; episporio 
obscure cinnamomeo-brunneo, 
ca. 1.5 u crasso, rare et distincte 
echinulato; poro germinationis 
1, infra, hilo prope, instructo. 
Teliis hvpophyllis, sparsis, 
ovatis v. oblongis, 0.2-0.5 mm. 
longis, mox nudis, pulvinatis, DO OER A ANAE 
obscure castanels ; teliosporis uniporulus showing the single pore in the 
obovatis, 13-16 X 19-27 pm; lower part of the cell, near the hilum. 
episporio cinnamomeo-brunneo, 
ca. | crasso, apice incrassato (4-7 a), levi. 
Hab. in foliis Carieis debilis var. Rudgei, Central Village, Connecti- 
eut, Aug. 19, 1908. John L. Sheldon. 
The studies have also revealed another new species of Uromyces 
on Carex which has distinctive germ-pore characters. It has four 
equatorial pores, an arrangement fairly common in some groups of 
rusts, but seemingly rare in the Carex rusts. None of the other present 
known species of Uromyces on Carex, and only one similar species of 
Puceinia has this character. In addition to the microscopical char- 
acters this new species is distinctive in the gross appearance of the 
uredinia and telia. The sori, especially the telia, have an unusually 
strong development. The following name is here proposed with 
accompanying description. 
Uromyces valens n. sp. Urediniis plerumque hypophyllis, sparsis, 
ovatis v. oblongis, 0.5-1 min. longis, epidermide diutius tectis, pulveru- 
lentis, cinnamomeis; urediniosporis ellipsoideis, 16-19 X 19-26 4, 
