TAK.EWO HEMMT 313 
9. Judging from the results of the inoculation experiments, we can infer 
that Valsa japonica is the direct Qause of this disease. But the fungus 
requires a wound to secure infection most easily, and for that purpose, 
the wound must not be new. It requires a layer of dead cells on the 
exposed surface, on which a mass of mycelium is first formed, and by 
accumulated strength it penetrates the living tissues below. 
10. This disease is always accompanied with gummosis. As to the process 
of the gum formation, I entirely agree with Butler and other investi- 
gators. 
1 1. The causal fungus grows in the bark, destroying the cellulose cell-walls 
of collenchyma, parenchyma, sieve tubes and at last the medullary ray 
cells. But it produces no change on the lignified membrane of scleren- 
chyma. In the woody portion, the hyphae penetrate into the wood 
vessels, medullary ray-cells and wood parenchyma. 
October 3, 1915. 
The Botanical Institute, 
College of Agriculture, 
Töhoku Imperial University, 
Sapporo, Japan. 
