494 
AMERICAN JOURNAL OF BOTANY 
[Vol. 9. 
its leaves were green and vigorous, and in general still making considerable 
growth. The internal condition of the trunk and dead branches would 
soon, however, have made it a prey to wind and storm. This tree was 
about 35 years old and had reached a height of 31 feet with a 24-inch base. 
Sect, rsr 
// '( \ 
Fig. I. Diagram showing diseased area of the black locust. 
(Infection by Trametes rohiniophila Murr.) 
After cutting and sectioning, it was soon evident that the fungus had 
entered by an old borer hole through one of the large upper branches now 
dead. As shown in the diagram of the tree (fig. i), the rot, starting in 
this branch about 15 feet above ground, moved downwards through the 
branch and trunk. Another main branch near by had in the meantime 
become affected upwards from the trunk only a short distance. Both 
