July is, 1914 
Influence of Host on Puccinia 
3°9 
pogon plants. In this paper this pedigreed teliosporic material (No. 6) 
is designated “Puccinia ellisiana from Pentstemon,” in order to dis¬ 
tinguish it from the teliosporic material of the ordinary Puccinia andro - 
pogonis . The source of each individual lot of inoculating material used 
in 1914 is noted in each table in column 3. 
All of the inoculations were made in the greenhouses of the Bureau of 
Plant Industry at Washington, D. C., and all of the hosts were kept in 
the greenhouses until the urediniospores were fully developed. The 
stools of infected Andropogon were then transferred to widely separated 
cold frames between the different greenhouses where the urediniospores 
and teliospores could develop normally and yet be entirely free from 
chance contamination. 
If the infected grass is kept in the greenhouse all summer and fall, 
the rust fails to spread and finally dies, so that no telial material whatever 
is obtained. This disappearance of the rust from the infected leaves is 
due to several causes, the most important of which are slugs, high tem¬ 
perature, dry air, and lack of dew at night when under glass in the green¬ 
house. 
Tabled III .—Teliosporic culture data for Puccinia ellisiana , P. ellisiana from 
Pentstemon, and P. andropogonis 
PUCCINIA EU.ISIANA 
Species inoculated. 
A3cial ancestral 
host. 
Source of 
inoculation 
material. 
Date of 
inocula¬ 
tion. 
Degree of 
infection. 
Pycnia. 
J 95 cia. 
Viola tricolor (culti¬ 
vated pansy). 
Viola tricolor. 
Viola papilionacea. 
Viola palmata. 
Viola sagittata.. 
.do. 
.do. 
Pedigreed, Vin¬ 
son. 
.do. 
.do. 
1914. 
Apr. 17 ; 
May 12 
Apr. 17 
May 12 
Apr. 27 
May 12 
Apr. 19 
Apr. 17 
Apr. 20 
Apr. 23 
Apr. 17 
Apr. 16 
May 11 
Apr. 16 
Apr. 17 
Apr. 20 
Apr. 23 
May 11 
May 16 
Apr. 16 
Apr. 23 
Apr. 17 
Apr. 28 
Apr. 17 
May 8 
Apr. 17 
Apr. 28 
May 5 
May 8 
Vigorous. 
Poor... 
Fair. 
_do. 
1914- 
Apr. 28 
May 26 
Apr. 29 
May 26 
May 25 
May 10 
Apr. 30 
Apr. 29 
May 1 
Apr. 39 
1914. 
May 6 
June 4 
May 6 
June 4 
June 2 
May 20 
May 7 
May 15 
May la 
May 7 
Pentstemon laevi- 
gatus. 
Do. 
.... .do. 
.do. 
.do. 
.do. 
No infection 1 ... 
Pair. 
Do. 
.do. 
Spruce. 
Good. 
Viola tricolor (culti¬ 
vated pansy). 
Do. 
.do. 
.do. 
Pedigreed, Clar¬ 
endon. 
.do.; 
.do. 
.do. 
Fair. 
No infection. 
_do. 
Do. 
Viola sagittata. 
Viola papilionacea.. 
Viola canadensis.. . 
.do. 
.do. 
.do. 
.do. 
Pentstemon laevi- 
gatus. 
Do. 
Vi£oroit<i _ 
Apr. 37 
May 7 
.do. 
No infection_ 
Do. 
Pair. 
May 3 
May 7 
May 16 
May 23 
Do. 
.do. 
No infection. 
Do. 
.do. 
Do. 
_do... 
Pentstemon tubi- 
florus. 
Do. 
.do. 
Viola papilionacea. 
Do. 
Viola papilion¬ 
acea. 
Pedigreed, 
Court lands. 
Fair. 
No infection. 
Apr. 29 
May 10 
Viola tricolor. 
Viola canadensis.. . 
.do. 
.do. 
.do. 
.do... 
Poor... 
No infection.... 
May 1 
May 10 
Pentstemon laevi- 
gatus. 
Do. 
.do. 
.do.. 
Good. 
May 10 
May ao 
Do. 
No infection. 
Do. 
Good.. 
May 17 
May 26 
1 Pentstemon too young. 
