﻿Arthur and Fromme: A new Endophyllum 57 



With these results in mind a search was made for other aecia 

 on malvaceous hosts that might be of a similar nature. An un- 

 named species of Aecidium on Sidalcea and Althaea, hitherto 

 considered distinct from Aecidium tuberculatum, proved to be so 

 similar morphologically that the identity of the two seemed 

 most probable. The Sidalcea form had been tentatively con- 

 nected with a grass rust, Puccinia Deschampsiae, from field 

 studies in Colorado by Mr. E. Bethel, that were afterward in- 

 spected by Dr. F. D. Kern and the senior writer in company with 

 Mr. Bethel. Mr. Bethel's field attempts to prove this connection, 

 made at Eldora and Denver, Colorado, and reported to us, had, 

 however, been unsuccessful. At our request, Mr. Bethel sent us, 

 last September, plants of Sidalcea Candida infected with the 

 Aecidium in question. These spores on germination likewise 

 produced promycelia and basidiospores (Fig. 7) identical with 

 those of Aecidium tuberculatum. The identity of the two forms, 

 therefore, seems certain. 



The form is known on Althaea rosea from the single locality 

 of Red Cloud, Nebraska, where it was collected by the Rev. 

 J. M. Bates in 1910 and where the Callirhoe rust is reported as 

 "everywhere." Although we have had no opportunity of testing 

 the germination of its spores there is no real question of its identity 

 with the Callirhoe and Sidalcea rust. 



