4 BOTANICAL MAGAZINE. [Vol. XIX. 



The asci are cylindrical, sometimes narrower at the middle portion, 

 truncate or slightly rounded at the free ends, and rounded, broader and 

 thick-walled at the b.ises. They measure 63-90 p. in length and 16-25 p. in 

 breadth. They have no stalk cells and intrude themselves slightly between 

 the cells of the epidermis. The mature asci are filled up with numerous 

 conidia of elliptical form (Fig. 13). The formation of the asci takes place 

 first in May and continues till the end of September. 



This species can not be referred to any Taphrina on Alnus. From 

 T. Tosquinetti Magn. and T. epiphylla Sadeb., which both cause the 

 similar deformation of branches, it can be distinguished by having much 

 larger asci and by having no stalk cells. 

 December 1904. 



Botanical Laboratory, Imperial University, Tokyo. 



EXPLANATION OF FIGURES IN PLATE I. 

 Figs. 1-6. Taphrina truncicola. 



Fig. 1. Diseased shoot with hypertrophied stem and petioles. Nat. size. 



Fig. 2. Diseased inflorescence. The lower three flowers have affected stalks, 

 while those of the upper two are quite free from the attack of 

 the fungus. 



Fig. 3. Cross section of the diseased stem, showing the massive develop- 

 ment of the cortical parenchyma around the small fibrovascular 

 bundles. Slightly magnified. 



Fig. 4. Subcuticular mycelium in surface view, x 400. 



Fig. 5. The same shown in cross section, x 400. 



Fig. 6. Young and mature asci. x 400. 



Figs. 7-9. Taphrina Piri. 



Fig. 7. Subcuticular mycelium transforming into the ascogenous cells. 



x400. 

 Fig. 8. Asci. x400. 

 Fig. 9. The same showing their basal portion, x 680. 



