-( 49 )- 



ellipsoidal in shape and thick walled. 



The diagnosis of the fungus may be given as follows : 



Helmiathosporium Oryzae Hori et Miyabe. Effusum, atrum, tenue velutimum; 

 Lyphis fertilibis fasciculatis, subnexuosis 102 175/^x3,4 6.8/i, 2 4 septatis, 

 extimis hyalinis ; basi subincrassatis ; conidiis magnis, oblougis falcato-ver- 

 miculatis, (5.7 8/^x13 17/A, ntrinque rotundatis, 6 7 septatis. 



Hab. in folis et regminosis Oryzae sativae, in Shizuoka-ken, Okayama-ken, 

 Hokkaido, et Kiushu. 



II. On the Black-spot Disease of Camphor tree.* 



As the system of the government monopoly of the camphor industry 

 recently came into operation, and thence the cultivation of the camphor tree 

 (Cinnamomum camphora Nees) is encouraged by the authorities, the industry has 

 greatly attracted the attention of the public, and the injurious insects and fungi ou 

 the tree have afforded the entomologists and mycologists of this country a large field 

 of work. A few reports concerning some of these pests, have already been 

 published. In. -this paper I intend to report on the result of my study on a 

 disease of the tree performed at the Fukuoka-ken Agricultural School, from June 

 1905 to August 1907, where young camphor-trees of three years old were severely 

 damaged by a new disease. 



As the first symptom of the disease, brown spots elliptical in shape and 

 having a diameter of 2 to 3 mm. appear ou the surface of young branches. They 

 soon turn black and increase both in size and number. Finally the surface of the 

 branches and trunks of the tree becomes black, and the ends of the young shoots 

 begin to die. Often the blackened bark splits into small cracks in several places. 



On the diseased tree, the larvae and the imagoes of Phleothrips swarm 

 abundantly. The larvae are conspicuous by their orange color, while the imagoes 

 black in color with white wings creep slowly with their abdominal end erect. The 

 insect was studied by Prof. Dr. Sasaki, and was described by him f under the 

 name of Phleothrips nigra Sasaki. 



On the black spots of the bark of the diseased camphor tree, I have detected 

 two species of fungi, one of whicli belonging to Gloaosporium and the other 



*Hot. Mig. Tokyo, No. 53, Feb. 1908. 

 {"Injurious Insects on Camphor tree." 



