i8 
WALTER SPURGEON BEACH 
Table 3 
Infections with Septoria convolvuli Desm. from Convolvulus sepium 
Conditions 
Plants Inoculated 
No. Leaves 
Infected and 
Inoculated 
No. of 
Spots 
Remarks 
f-b 4 
g-b4 
g-b 4 
g-b 4 
f-b 4 
f-b 4 
g-b 4 
g-b 3 
g-b 4 
g-b 4 
g-b 4 
g-b 4 
g-b 4 
g-b 4 
Convolvulus sepium . 
II << 
<i <( 
Convolvulus arvensis 
H It 
Ipomoea purpurea. . 
Ipomoea batatas. . . . 
Ipomoea learii 
Ipomoea setosa 
6/7 
5/5 
5/6 
1/5 
17/23 
0/7 
0/12 
0/25 
0/35 
0/79 
0/5 
0/5 
o/io 
0/5 
o/io 
0/15 
0/20 
0/5 
21 
12 
16 
4 
53 
Check, spots large 
Few minute spots, no 
pycnidia, infection doubt- 
ful 
fungus from C. sepium, no disease spots with pycnidia were obtained upon 
any of 79 leaves inoculated, although minute brown spots, usually less 
than I mm. broad, were often formed. The significance of these spots is 
unexplained, though they may represent incipient infection. 
Diagram 5. Infections with ^e^/ma wa/- Diagram 7. Iniections with. Septoria septu- 
vicola from Malva rotundifolia. lata from Convolvulus arvensis and S. convol- 
vuli from C. sepium. 
Septoria convolvuli is reported upon Ipomoea purpurea, but all attempts 
to infect species of Ipomoea were futile. 
Were the two forms of Septoria under consideration to be accepted as 
belonging to a single species, here would be a well established case of biologic 
