336 Report oF THE HorrTicuLTuRIST OF THE 
those made in the larger tree were unprotected. The dark spored 
fungus grew at all points of inoculation, while all of the other 
wounds soon healed. 
On July 11 an effort was made to imitate the scars that are 
found in the outer bark that are mentioned on page 339. Small 
pieces of the outer bark were cut from two small areas on sepa- 
rate limbs of a large tree which were inoculated with the dark 
spored fungus, making twenty-eight inoculations in all. Two 
similar areas were inoculated with Schizophyllum commune and 
two areas were prepared but not inoculated to serve as checks. 
Ten inoculations with the dark spored fungus, two with Schizo- 
phyllum commune and two check wounds were made by cutting 
through to the wood as before. All inoculations and check wounds 
were kept moist with damp filter paper. The dark spored fungus 
grew at all points of inoculation producing deep wounds or cankers 
where the incisions were made through to the wood as is shown 
in Plate XXX, fig. 38. Fig. 1 of the same plate shows the effect 
of the inoculations where small pieces of the outer bark were 
removed. The fungus was unable to penetrate to the cambium 
and made only small surface wounds, as may be seen in the illus- 
tration. The pieces of bark have been removed on one side leay- 
ing scars which resemble those that occur on cankered limbs as 
in Plate XXX, fig. 2. 
On the same date, July 11, four inoculations were made with 
each of the two cultures in the larger limbs of a pear tree and 
four of each in the larger limbs of a quince tree. The inocula- 
tions, together with check wounds, were kept moist with damp 
filter paper az before. The dark spored fungus grew at all points 
of inoculation on the pear tree, but did not grow on the quince. 
All of the inoculations with Schizophyllum commune together with 
check wounds soon healed. 
These experiments showed conclusively that the dark spored fun- 
gus can penetrate living apple-tree bark under certain conditions 
and produce a cankered condition of apple-tree limbs and also 
indicated that it may produce a diseased condition of pear-tree bark. 
