212 



found which has uredinia agreeing with the type .specimen of 

 Uromyces Aristidae Ellis & Ev. There is an unnamed Puccinia 

 from central Mexico which is like it in possessing paraphyses 

 but which has the characters both of the paraphyses and ure- 

 diniospores so different that there is scarcely a possibility of 

 their identity. It is, therefore, impossible to dispose of the 

 Uromyces Aristidae Ellis & Ev., of which there is known but the 

 one specimen consisting of uredinia only, in any definite way 

 without additional material and further study. It is certain, 

 however, that the name U. Aristidae Ellis & Ev. can no longer, 

 in the face of the foregoing facts, be applied to the real Uromyces 

 on Aristida. Through the work of Arthur* this Uromyces-iorm 

 has been culturally connected with an Aecidium on various species 

 of Plantago. According to the practice followed by some mycolo- 

 gists the specific name of the aecial stage may become the name 

 of the species provided the telial form has never received a name. 

 In this instance, however, no such procedure is possible there 

 being no available aecial name. The American aecia on Plantago 

 have passed under the name Aecidium Plantaginis Ces. but they 

 are distinct from that form. It is, therefore, necessary to supply 

 a name for the Aristida- Plantago species which may be described 

 as follows: 



Uromyces seditiosus sp. nov. — O. Pycnia amphigenous, gre- 

 garious, inconspicuous, honey-yellow becoming brownish, sub- 

 globose, 8o-ioOjLt in diameter by ioo-ii2yu high. 



I. Aecia amphigenous, gregarious, cupulate or short-cylin- 

 dric, 0.2-0.3 mm. in diameter; peridium colorless, margin erose, 

 erect or somewhat recurved ; peridial cells rhombic in longitudinal 

 section, 28-35^ long, the outer wall thick, io-i3At, transversely 

 striate, the inner wall thinner, 4-5^, verrucose; aeciospores sub- 

 globose or broadly ellipsoid, 14-18 X 16-22 /jl, the wall colorless, 

 rather thin, 1.5/x, finely verrucose. 



II. Uredinia epiphyllous, scattered, linear or oblong, cinnamon- 

 brown, naked; urediniospores globoid, 19-26^1 in diameter, the 

 wall cinnamon-brown, moderately thick, 2-2. 5;U, minutely ver- 

 rucose, appearing almost smooth when wet; pores rather indis- 

 tinct, 4, equatorial. 



III. Telia epiphyllous, scattered or sometimes crowded and 



. * Bot. Gaz. 35: 17-18. 1903. 



