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RESUME. 



The Sclerotinia disease is one of tlie well known and widely distributed 

 diseases in orchards. In pAU'ope and America, it attacks several kinds of fruit- 

 trees, such as apple, pear, peach, plum, apricot and cherry. Sclerotinia 

 fructig-ena (Pers.) Schröt. on apple and pear trees, Scl. laxa (Ehrenb.j Aderh. 

 et Ruhl. on plum and apricot trees, and Scl. cinerea (Bon.) Schrot, on cherry 

 trees are all found in Hokkaido and in some other places in Japan. Fruits 

 are the portion generali}^ attacked by these fungi. The cases, where the 

 flowering branches are affected, are only known to us in apple and cherry 

 trees. The former is more prevalent in northern Japan, often doing great 

 damage. According to my own observations, the young leaves on a flowering 

 branch seem to be the portion commonly attacked at first. The discolored 

 portion generally appears along the midrib. The mycelium of the fungus 

 extending along the vascular bundle reaches the branch, where at length 

 growing into the cavities of vessels, it hinders the ascent of sap, causing the 

 withering of flowers and leaves. On the discolored spots on the leaves and 

 branches, microconidia or macroconidia may be produced according to circum- 

 stances. I found microconidia in several previous occasions, but macroconidia 

 for the first time this year. 



In 1900, I found large irregular shaped black sclerotia in a fallen decaying 

 I)ear. Their texture was looser than that of Sclerotinia Libertiana. Although 

 I kept them buried in the ground during a winter, no apothecia developed on 

 them. The matter was made clear by the late discovery by NORTON, and by 

 the confirmatory results obtained by AderhOLI) and RuilLAND of the facts, 

 that the sclerotia reach their maturity after two years' hibernation, and that 

 the apothecia are only formed on them in the third year's spring. 



In 1903, P. Hennings published the description of a new species of 

 Monilia on the leaves of the Japanese cherry, J^iiinns Psendoccrasns, collected 

 in Tokyo, inider the name of Monilia Knsatioi. He notes, that the species is 



