TAKEWO HEMMI 259 
In Australia, McAlpine (1902) l7) described the same pyenosporous stage, by 
the name of Cytospora leucostoma, on almond, peach, plum and cherry twigs. 
In America it was first described by Rolfs (1907) m , who found it upon peach 
and Japanese plum. 
Valsa oxysloma Rehm is known as the cause of a disease of the alder-tree 
in Europe. It was first described by Rehm (1882) ?2 \ who thought it to be a 
saprophyte. But in 1893, Tubeuf 30) ascribed the death of the twig of Alnus 
viridis to the attack of this fungus in Germany, and in 1899 the same fungus 
was observed by P. Nvpels ,9) in Belgium to cause the disease of Alnus gluti- 
nosa. 
Valsa ambiens Fr. was shown by M. C. Cooke 7) to seriously affect the 
living bark of apple-trees in Europe, although the fungus is usually considered 
as a pure saprophyte. Valsa Prunastri (Peks.) Fr. is known to be the cause 
of a serious disease of plum, apricot, peach and apple trees in Europe. 
In our country there is a species of Valsa causing the destructive canker 
disease on apple trees. The disease was first discovered in the Aomori Pre- 
fecture, but it is now widely spread in Hokkaido. Prof. K. Miyabe and Prof. 
G. Yamada studied the fungus and named it Valsa Mali Miy. et Yam. It is 
an endemic species. Its description appeared for the first time in 190:) in Ide- 
ta's Hand book of the Plant-Diseases in Japan 1 -\ 
There are, besides, two more very destructive Valsa diseases in our 
country, which have not yet been reported. One is on Paulownia * and the 
other is on the Japanese flowering cherry-trees, Japanese apricot and peach- 
trees. I he latter was taken up as the subject of my present investigations, 
as it is the more important from the economic standpoint. 
3. Symptoms of the Disease. 
a. General Appearance of the Diseased Trees. 
It is easy enough to distinguish this disease on the bark of the branches 
* From our studies, this fungus also seems to be new to science. We named it, therefore, Valsa 
Fautovmiae Miyabk et HEMMI. Its diagnosis will be given in another paper. 
