22 
WALTER SPURGEON BEACH 
it is a marked parasite ; frequently the whole surface of some leaves is dis- 
colored by the confluent spots. 
Septoria lycopersici Speg. 
The inoculations with Septoria lycopersici gave results in agreement with 
those published by Norton (22) who inoculated several plants related to 
the tomato in humid atmospheres. He states that spots developed better 
and spores were larger on potato and Solanum carolinense than on tomato, 
while on Datura the spots were slow-growing, light -colored, and small- 
spored. In the present experiments the spots on potato were darker in 
Diagram ii. Infections with Septoria lycopersici from tomato. 
color and smaller than those on tomato, while those on Solanum carolinense 
were likewise darker in color, but larger, and often coalesced until the leaves 
were destroyed. The spots on Datura were very similar to those described 
by Norton. Spores developed upon the potato and Solanum carolinense 
produced full infection of tomato leaves. 
Septoria lepidiicola Ell. & Mart. 
Septoria lepidiicola is reported upon only Lepidium virginicum and 
L. apetalum. The data in diagram 12 show that the fungus on these two 
hosts is identical biologically as well as morphologically. The negative 
results obtained when plants belonging to other genera of Cruciferae were 
inoculated indicate that the fungus is confined to the species of Lepidium. 
No data are at hand to show whether it will attack more than the two species 
of the genus. The failure to obtain signs of incipient infection, such as 
spots without spore-bearing bodies, upon species outside the genus Lepidium 
I 
