8 WALTER SPURGEON BEACH 
Table i — Continued 
No. of 
Check In- 
Date 
Conditions 
Plants Inoculated 
Leaves In- 
No. of 
fections on 
fected and 
Spots 
Original 
Inoculated 
Host 
Spores from Polygonum lapathifolium 
Sept. 21 
f-b3 
Polygonum orientate 
many 
8/8 
Sept. 21 
f-b4 
Polygonum hydropiper 
0/25 
8/8 
Sept. 21 
f-b4 
0/20 
8/8 
Sept. 21 
shaded 
0/20 
8/8 
Oct. 7 
g-b4 
Polygonum convolvulus 
0/12 
Dec. 3 
moist 
Polygonum convolvulus 
3/7 
5 
chamber 
(leaves detached) 
Oct. 7 
g-b 4 
Fagopyrum esculentum 
o/io 
Dec. 3 
moist 
Fagopyrum esculentum 
chamber 
(leaves detached) 
0/7 
Dec. 3 
moist 
Rumex crispus 
chamber 
(leaves detached) 
0/7 
Septoria polygo7torum was isolated, and the growth characters were alike 
in the fungus as isolated from each of the four hosts in group A. No 
distinctions in biological characters, as shown by their powers to infect, 
were apparent among these four stocks of the same Septoria from as many 
different hosts, at least in the light of the experiments thus far conducted. 
Diagram i. Infections with Septoria polygonorum from Polygonum pennsylvanicum, 
P persicaria, and P. lapathifolium. 
