AMERICAN UREDINE.E. 



397 



of Agrostis is due largely to inferior nutrition afforded by the 

 host. . 



The fe 9 on Hordeum jubatum has been separated as a dis- 

 tinct species under the name Puccinia jubata E. & B. Through 

 the kindness of Mr. Bartholomew, whose zeal, open-minded- 

 ness and liberality have placed us under the deepest debt of 

 gratitude, we have received part of the type material used for 

 the description of the species, and also a recent gathering of 

 the same form for use in the accompanying distribution (30/). 

 Comparison of this material with other collections on Hordeum 

 jubatum and H. murinum and with material on Triticum^ 

 Agrostis and other hosts, accepted as genuine Puccinia fiocu- 

 liformis, shows no valid morphological reason, so far as w e can 

 see, for keeping the forms apart. The uredospores may be 

 slightly smaller than on Triticum. and the teleutospores, as 

 pointed out by the describers. slightly less robust, but they do 

 not vary as much from the Triticum standard as does the form 

 on Agrostis. Some additional proof of identity is afforded by 

 cultures conducted bv Wm. Stuart in the Purdue University 

 laboratory during the present season. Sowings of uredospores, 

 from Hordeum jubatum growing in the vicinity, made upon 

 the leaves of wheat, formed uredosori in eight days, and later 

 upon the leaves of barley in seven days, showing abundant 

 typical development, and with no failures or contaminations. 

 The cultures were made during August. 



In citing exsiccati the same rule is followed as in selecting 

 material for the distribution: only such specimens are men- 

 tioned as the authors deem to be beyond question referable to 

 the species. 

 ex sic : 



Ellis, N. A. F. 1010 1 . 

 Carleton, Ured. Amer. 9 111 , -y 11 , ,11 - 



Sydow, Ured, 267', 26S 1 , 372 ' , 517', ^iS 1 . 771'. 772'. 871', 19 1 ", 119' ", 

 5i9 ,ll i 570 111 , 721 111 . 770 111 . 



Seymour and Earle. Econ. Fungi S4, 85, V! . 86£, 87a, 87$. 



Vize, Fungi Brit. 8 111 , 76 1 . 



Linhart, Fungi Hung. 34 111 , 126 1 . 



Allescher and Schnabl. Fungi bav. 414 111 , 24 1 . 



Thuemen, Myc. univ. 29 1 . 



Krieger, Fungi sax. 211 1 . 



Jaczewski, Komarov and Tranzschel, Fungi Ros. Exsic. 18 1 . 



