2 BOTANICAL MAGAZINE. LVol . XXIi 



The characteristic changes of the diseased portions, which accompanies 

 the hypertrophy, are at first pink reddish, then rosy colouration on their 

 surface and the succulent consistence of the tissue. 



These portions consist chiefly of a large mass of soft and spongy 

 parenchyma. At the center of this tissue we find a small group of fibro- 

 vascular bundles which can be available for conducting substances in a 

 usual manner (Fig. 3). That the blades, flowers and leaflets are capable 

 to accomplish their normal development upon the diseased portions must 

 be ascribed to the presense of these bundles. 



The mycelium is very abundant and forms a network of threads 

 between the large cells of the hypertrophied tissue. The subcuticular 

 mycelium goes on all into the formation of ascogenous cells (Figs. 4, 5). 



The asci are stalked, slightly clavate or cylindrical, rounded at the free 

 ends, measuring 37-45 fx in length and 8 7-10 fi in breadth (Fig. 6). The 

 stalk cells are long, usually rounded or truncate and sometimes broader at 

 the base. They do not intrude between the cells of epidermis. They are 

 13-20 fi long and 10-13 [i broad (Fig. 6). The ascospores are spherical in 

 form measuring 4-5.8 y. in diameter. Their number in an ascus is variable, 

 but usually 8. 



In general appearance both of the asci and of the habit, the present 

 species seems to be closely allied to some other Taphrina on Prunus, viz., 

 T. minor Sad., T. decipiens (Atk.), T. mirabilis (Atk.) and T. Farlowii 

 Sad., but it differs from all of these, chiefly by forming the asci only on 

 the axial portion. 



My repeated observations show that this fungus effects no less injury 

 upon Prunus incisa which is a common tree at Nikko. That the disease 

 caused by this fungus prevails at Mt. Mitake in Prov. Musashi has been 

 affirmed by Mr. Y. Yabe when he visited that mountain in this May. 



Taphrina Piri Kusano n. sp. 



(Figs. 7-9). 



This fungus forms pale yellowish, then whitish scurfs on the leaves of 



Pirns dliyabei fcargant. The scurf may he roundish being 2-3 mm. in 



diameter or it may extent as a long stripe between the lateral veins. 



Sometimes it spreads over the greater part or nearly whole of the leaf, 



causing distortion of the blade. 



