20 
F. T. Brooks and S. R. Price. 
character as those previously described were formed in the tissues. 
Fig. 13 shows the wilting of a plant inoculated with this mycelium 
side by side with a control plant. The fungus plated out from 
these pycnidia agreed in cultural characters with the fungus which 
had been used for inoculation. Fig. 7 represents fresh spores 
obtained from these pycnidia. Fig. 8 shows fresh spores obtained 
from a plant infected in nature. 
The same mycelium placed in wounded parts of the fruits 
caused rotting of the tissues and formation of pycnidia as previously 
described. The fungus plated out from these pycnidia was identical 
with that used for inoculation. Figs. 9 and 10 represent sections 
of these pycnidia in different stages of development. 
The results of these inoculation experiments make it clear that 
the fungus causing a rot of the fruit is identical with that which 
induces canker on the stem. 
Fig. 12. Photograph of plant inocu¬ 
lated with the mycelium of the fungus 
isolated from the fruit. A control plant 
is at the side. 
Fig. 13. Photograph of plant inocu¬ 
lated with the mycelium of the fungus 
isolated from the stem. A control plant 
is at the side. 
The Ascus Fructifications of the Fungus. 
Grossenbacher 1 has shown in America that Diplodina citrullina 
(C. O. Sm.) Grossenbacher, or Ascochyta citrullina, C. O. Smith, 
as it has also been called, is the pycnidial stage of the Ascomycete, 
1 Grossenbacher, J. G., in N.Y. Agric. Expt. Sta., Geneva, N.Y., Tech¬ 
nical Hull. No. 9 (1909). 
