2(5^ ON " A NEW CANKER-DISEASE OF PRUNUS YEDOENSIS, etc. 
In July of 191 4, I collected a species of Cylospora on the dead twiglets 
of the European cherry, Prunus Cerasus L. The morphological charac- 
ters of its spores are very much like those of the pycnospores of our fungus ; 
but its cultural characters seem to be more or less different, and the inocula- 
tion experiments have also shown negative results. 
5. Distribution of the Disease and Extent of the Damage. 
This disease is common not only in the vicinity of Sapporo, but seems also 
to be widely distributed throughout Hokkaido. 
In September of 1914, I found diseased branches on Prunus ycdocnsis at 
Asahigawa, and an examination showed that it also was due to the same 
fungus. In February of 191 5, Mr. S. Nishida collected the same fungus, also 
on Prunus yedoensis, at the Hakodate Park, and in May of the same year he 
again visited the same place for me and counted about thirty trees attacked 
by this disease. 
From other parts of Japan we have not yet been informed of the outbreak 
of this disease. I received negative answers to all my inquiries to various 
places in Honshu. In spite of careful search for the disease made by my 
friends Mr. M. Yatagai and Mr. Y. Takexouchi and me during our journey 
through Honshu, we did not find it. Among the specimens collected by Mr. 
M. Yatagai in Tokyo, there is one on a cherry tree which resembles our 
disease in its external appearance, but whose microscopical characters are 
very different. Through the kindness of Prof. K. Miyabe, I was able to 
examine the diseased brandies of the peach which were sent to him from 
Gifu. It is due to the attack of a certain species of Cytospora, the morpho- 
logical characters of which are epiite different from those of our fungus. 
Judging from these facts, it is safe to conclude for the present that the disease 
0:1 the species of Prunus is limited to Hokkaido. 
In the vicinity of Sapporo the damage caused by this disease is by no 
means small. Almost all aged trees of Prunns yedoensis have their branches 
more or less attacked by this fungus. There are, indead, numerous branches 
