364 BROOKLYN BOTANIC GARDEN MEMOIRS 
general, he concludes that species of the same section of the genus as 
the one serving as a source of uredospores were more fully infected 
than the species of other sections. The evidence for Ward’s con- 
clusion is not very striking except in the case of the two hosts Bromus 
mollis and B. sterilis. Some of Ward’s data may be indicated as 
follows: 
Source of Uredospores 
Host Inoculated | Bromus| Bromus \Wespaostes| Barorace| 
arven- | brizae-| Prourus secalt- |arduen-| Bromus 
| sts | forms mollis nus | nensis| Sterilis 
Serrafalcus: | | 
Bromus arvensis.............:: | 12/135| 10/9 33/97 6/8 | 
Bromus brachystachys.......... 13/14 | 14/14 TAT | 
Bromus brizaeformis...........) 7/17] 7/15| 14/25 | 3/5 | 
BL OMUUSHKG. CUSCUM Bieta ie nchtee | 2T/27 a1 | 14/59 
Bromus macrostachys........... | 14/15 | 16/17 5/19 5/5 | 
BrOMUS MOLtOVINIS 22,2 see oe - 2/6 1/25 
BROMUSINOLIS See eee Tao 8/15 | 21/26| 119/154 | 3/8 1/3] er 
Bromus pendulinus.. 2. .50.0:- 8/6 | 43/40) 30/50 | | 17/65 
(BLOMUS. SCCOLUNUS:. 3.0 act aes oe 14/14 |14/15| 31/61 |16/16| 8/8 
IBY OIMUSHUCSTULIUES  eemeere exe icles exe 2/Ae | | 1/4 
Libertia: | 
Bromus arduennensis........... | | 13/14 | | 8/7 
Stenobromus: | 
(BLOMUS EUSSONUA ee wie ee eee oe | 10/26 6/53 | 37/60 
BEGMUS MOAN SES ates e)toisiee « | | 11/13 1/13 | 43/68 
BRONUVUSHINGXUNTUUS eae ieiereeieier | 1/74 | 2/82 
BLOMUS SLCTUTS akties einen | 4/148 | | 126/146 
Freeman (56) has made a further study of the brome rust, using 
uredospores from Bromus mollis and B. sterilis. He states that twenty- 
two different species of Bromus remained free from infection following 
inoculation with rust from both hosts. Eleven species were infected 
with uredospores from B. mollis but not with uredospores from B. 
sterilis. Only one host, B. sterilis, was infected by uredospores from 
B. sterilis, and not by uredospores from B. mollis. Five species were 
infected with spores from both grasses. 
Puccinia Stipina Tranzschel. Under this name, Tranzschel (156) 
groups the North American rust Puccinia Stipae Arth., with uredo 
and teleuto on Stipa spartea and aecidial stage on Aster ericoides, A. 
multiflorus, A. Novae-angliae and Solidago canadensis, and the Euro- 
pean rust, Puccinia Stipae Bubak, with uredo and teleuto stages on 
Stipa capillata and aecidial stage on Thymus and Salvia. Klebahn 
(87, 91) finds evidence for two specialized races in the European rust: 
5 The denominator indicates the number of leaves inoculated and the numerator 
the number infected. 
