198 THE BOTANICAL MAGAZINE. ^yo\. xxy. No. m 



the past three 3Tars in the vicinity of Shirone. If the above 

 mentioned Gloeosporium sp. of Yoshino be the same as m^^ 

 fungus, the distribution of the disease would be widespread, as 

 could be inferred from the places of its collection, so widely 

 distant as Higo and Echigo. 



I Avish to express here my heartiest thanks to Prof. Dr. 

 K. AIiYABE to whom I am indebted for his many valuable 

 suggestions and to Air. S. Toyama who had the goodness to 

 aid me in the collection of samples. 



Symptoms of the Disease.— The diseased spots may be ob- 

 served early in the middle and later part of July, when the 

 fruit is not yet ripe. They appear first as very small, pin-head 

 sized black specks, which day after day gradually enlarge their 

 area. These affected spots on a single fruit are variable in 

 number, sometimes only one, occasionally as much as fifteen. 

 The enlarged specks assume the size of 1 to 2.o cm. in diameter. 

 They are circular or elliptical in outline, frequently bordered 

 with a yellowish brown ring and slightly sunken. When a 

 number of specks are formed on a fruit, they often coalesce 

 forming very large, irregular shaped spots. On the larger and 

 older spots numerous small black pustules slightly raised and 

 arranged somewhat in concentric rings, begin to appear. These 

 pustules soon break through the epidermis, discharging salmon- 

 coloured, sticky spore-masses. At or previous to this period, 

 the majority of the affected fruits fall to the ground and turn 

 yellowish brown in colour. The decomposition of these fallen 

 fruits is hastened by the growth of vnRnj saprophytic fungi 

 and bacteria. The disease also attacks the ripe fruits in storage. 

 Some growers of this fruit tree in Prov. Echigo informed me 

 that similar symptoms sometimes appear on the young branches, 

 but I failed to find such a case during my excursion. 



Nature of the Causal Fungus.— Sections through a diseased 

 spot show that a cushion of stroma is formed just below the 

 epidermis, and that the countless spores formed on the stroma 

 push upward until the covered epidermis is ruptured and the 

 mass of spores is exposed to the air. The conidiophores are 

 hyaline, simple and variable in length (10-25 x 3-5/i). A conidium 



