70 
Mycologia 
May 27 ; also sown same date o» Euthamia graminifolia, showing 
pycnia May 22, at aecia June 4. 
The significant thing about these cultures is that the material 
from Carex scoparia, which was sent by Mr. W. P. Fraser, grew 
on both Aster and Euthamia. The rust on this species of Carex, 
as represented in the herbarium, was for a long time considered 
sufficiently diverse morphologically to constitute a distinct spe- 
cies. Two years ago material on Carex scoparia from Maine was 
cultured on Euthamia, but did not grow on Aster paniculatus 
or Solidago canadensis. This year sowings were made on the 
three hosts named and results obtained on two of them. It was 
pointed out in the discussion of the results two years ago that the 
Aster-Solidago-Erigeron group of Carex rusts probably consti- 
tutes a single species with a number of more or less defined races. 
The same view has been expressed elsewhere. Numerous con- 
firmatory facts of diverse nature have been accumulating, until it 
seems advisable to adjust the nomenclature to accord with present 
knowledge. 
This species is one of the most common forms of rust in North 
America. It evidently is less abundant in South America and 
in the eastern hemisphere. The morphological study of similar 
European forms, rated as species, discloses some that undoubt- 
edly are to be classed in the same category with the American 
group. Without taking space to record the evidence, the con- 
clusion has been reached that the most available name for the 
American and European constituents of the species here repre- 
sented, but possibly not the oldest one, is Puccinia extensicola 
Plowr. This name was founded on telial material from Carex 
extensa, obtained at Norfolk, England, and cultured on Aster 
Tripoli, and is in every way comparable with the Carex-Aster 
forms of America. 
3. Puccinia angustata Peck. — Teliospores on Scirpus atro- 
virens, collected at Lafayette, Ind., by L. O. Overholts, were sown 
10 Mycol. 4 : 15. 1912. 
11 Arthur, The physiologic aspect of the species question. Amer. Nat. 
42: 246. 1908. 
12 For previous American cultures of this specific group, see Bot. Gaz. 
35:15,21. 1903 ; Jour. Myc. 8 : S3, 54. 1902; 11:58. 1905:12:15. 1906; 
14 : 13. 1908 ; Mycol. i : 233. 1909 ; 2 : 224. 1910 ; and 4 : 15, 16. 1912. 
