114 



Mycologia 



ington, Oct. 30, 1901. The host was originally identified as 

 Arnica foliosa Nutt., but interpreted by Arthur as A. cana Greene. 

 No other collections of a Coleosporium on Arnica have since been 

 received in this laboratory and there has been some doubt as to the 

 validity of the species. A year or two ago the writer, while work- 

 ing in the mycological herbarium of the New York Botanical Gar- 

 den, had occasion to examine the type specimen of Puccinia nuda 

 Ellis & Ev. This was also described as occurring on Arnica foliosa 

 .and was collected by Suksdorf (No. 200) in the same locality 

 July 30, 1885. On the herbarium sheet containing the specimen 

 of P. nuda there is a second collection of rust on the same host 

 made at the same place and date (Suksdorf, No. 199). Ellis at 

 the time he studied these specimens evidently supposed that the 

 latter collection bore the aecidium of P. nuda, since the manuscript 

 sheet of the original description in Ellis's handwriting (pasted on 

 the herbarium sheet with the specimens) included a description of 

 the rust on this collection as an Aecidium. When he published 

 P. nuda, however, Ellis omitted the aecial description or any men- 

 tion of the second collection. An examination of this made re- 

 cently shows that it is unquestionably the uredinia of a Coleo- 

 sporium identical with the type of C. Arnicale Arth. and on the 

 same host. 



More recently the writer has had occasion to study in detail the 

 type of Puccinia nuda. This species is also known only from the 

 type locality and collection. A few days previously Puccinia 

 Hemizoniae Ellis & Tracy had been studied and the close resem- 

 blance between the two species was at once noted. As a result of 

 this study the conclusion was reached that they are identical, and 

 that the host of P. nuda is probably not Arnica, but a species of 

 Madia, Hemitonia, Hemizonella, or some close relative of these. 



Puccinia Hemizoniae (including P. Madiae Sydow) occurs on 

 the same group of hosts as Coleosporium Madiae Cooke, and on 

 account of the conclusion just recorded with reference to the Puc- 

 cinia, the possibility that Coleosporium Arnicale was identical with 

 C. Madiae at once suggested itself. * 



A comparison of the two species has resulted in the conviction 

 that the former should be considered a synonym of the latter, and 



