1905,] NEW SPECIES OF EX0ASCACE2E. 3 



The subcuticular mycelium formed on the underside of the leaf converts 

 entirely into the ascogenous cells (Fig. 7). 



The asci are cylindrical and truncate or rounded at the free ends. 

 They measure 29-42.5 t u in length and 9—13// in breadth. They have no 

 stalk cells and sit directly on the epidermal cells with broader and trun- 

 cate or rounded bases (Fig. 8). The spores are globose or elliptical, variable 

 in number, but mostly S in each ascus. Their size is also somewhat variable, 

 ranging from 3 to 5 ix in diameter. 



It is a noticeable fact that the form of the ascus is somewhat diver- 

 gent from that which all Tophrina hitherto known on Kosacete acquire, 

 but belongs to Betulre-type which is applied by Giesenha°;en (1) to the gene- 

 ral form assumed by Taplirlna on Betulacese. 



This fungus is only known at present at Nikko (June 17. 1904, S. 

 Kusano). 



Taphrina japonica Kusano n. ep. 

 (Figs. 10-14). 



In the Botanic Garden of Tokyo I found a young witches broom on 

 Alnus japonica S. et Z. last winter. Standing erect upon a horizontal 

 branch, it has arrived at 3 years of age. The upper portion of each 

 branch of the broom represents a triangular form in cross section (Fig. 

 14 a). The cortex at this place is slightly hypertrophied and has many 

 longitudinal wrinkles on its surface. Such a portion seems to have been 

 so imperfectly developed as to die away during the winter. The branches 

 of the broom, however, show, as a whole, more or less rapid growth, becoming 

 longer and thicker than usual. 



The leaves, being all infected with the mycelium of the fungus, appear 

 in the spring somewhat earlier than those of normal branches. When 

 they reached to a certain size the growth is checked ; and they remain 

 pale, small and wavy on their surface till they wither and fall off from 

 branches. Such diseased leaves exhibit no essential anatomical modification, 

 except a slight increase in thickness caused by the enlargement of their 

 constituent cells. 



The wintering mycelium in the bud spreads over the whole surface of 

 every leaf and forms a dense hymenium over the epidermis of its underside 

 (Figs. 1Q-12). 



(1) Flora 81. p. 289. 



