AMERICAN UREDINE^. 315 



species of ^Ecidium was found in the type locality, abundantly 

 covering Mesadenia re n /for mis (Muhl.) Raf. [Cacalia reni- 

 formis Muhl.), which the discoverer and describer (1. c.) sug- 

 gested might be a part of the same species. In a communi- 

 cation dated Dec. 7, 1901, Dr. Davis says of the species: 

 "I know of but one station for it. The land on which that is 

 situated has been enclosed and used for grazing, and for the 

 last two or three years I have not found the rust. Coinci- 

 dently the aecidium on Cacalia reniformis disappeared, al- 

 though grazing has seemed to disturb the Cacalia very little. 

 From 1894 to 1897 all three forms were abundant, but over a 

 very limited area." There appears to be great probability 

 that we have in hand the aecidiostage of this species, but so 

 far no cultures have been made. 



In July, 1900, the species was collected by Mr. Wm. C. 

 Cusick at Wallowa Valley, Oregon, on Muhlenbergia race- 

 mosa (Michx.) B. S. P. and on M. comata Benth. No infor- 

 mation about the collection has been received, other than 

 what the specimens furnished, which appear to be entirely 

 typical. 



The species is quite distinct from the Uromyces found upon 

 Muhlenbergia in Mexico, which has been referred to Urom. 

 Peckianus Farl. (Bot. Gaz. 24:23). The latter has much 

 larger uredospores with equatorial pores. The spores of 

 Uredo muhlenbergice Diet, are also larger, and have equa- 

 torial pores. 



49. Puccinia dochmia Berk. & Curt. (1858. Proc. Am. 

 Acad. Sci. 4: 126.) 



49a. On Muhlenbergia ciliata Trin., Ill, Chapala, Mex., Holway. 

 496. On Perieilema crinitum Presl., Ill, Chapala, Mex., Holway. 



OriG. DESCR. "131. P. dochmia, Berk. & Curt. : soris oblongis; sporis 

 brevibus obtusissimis fuscis; pedunculo hyalino laterali. On leaves of 

 grasses, Nicaragua." 



SYN: 



1891. Puccinia windsorice australis Anders. Jour. Myc. 

 6:123. 



