A New Species of Taphrina on Acer. 



By 

 S. Kusano. 



With one Figure. 



Only four species of Taphrina have been hitherto known on 

 Aceraceae. 1} T. acericola Massac, on Acer campestris L. and A. 

 Pseudoplatanus L. from Italy is characterized by having asci 

 with short but broad stalk cells. A closely allied species, T. 

 acerina Elias, 2) is found on A. platanoides L. in Sweden. At 

 several places in Europe (Germany, Russia, Scandinavia and 

 Hungary) is recorded T. polyspora Johans. on A. tataricum L., 

 the ascus of which has no stalk cell. The American species T. 

 lethifera (Peck.) Sacc. on A. spicatum Lam., resembles the 

 latter in lacking the stalk cell in the ascus, 3) but it is not 

 identical, its body being much larger. 



The fungus which I am going to describe produces asci 

 with stalk cells like the former two species above mentioned, 

 but in other respects it is quite different from them, the dimen- 

 sions of the asci approaching rather to the latter two species. 

 It was found during my short stay at Nikko, 27. May 1906. 

 At that time the fungus was just in maturation so that an 

 accurate diagnosis may be drawn up of this material as 

 follows : — 



Taphrina nikkoensis Kusano n. sp. 



The fungus forms grayish scurfs on the leaves of the host, 

 whose outline is somewhat irregular and whose diameter ex- 



!) Giesenhagen enumerated in his paper published in 1901 only two species 

 (Taphrina, Exoascns nnd Magnusiella. Bot. Ztg. 59. 1901. p. 115). 



2 ) Saccardo, Sylloge Fnngorum XIV. p. 823; Eliasson, A. G., Taphrina acerina 

 n. sp. Bihang till K. Svenska Vetensk. — Acad. Handlingar. XX. in. Nr. 4. 1805.' p. 3. 



3 ) Saccardo, 1. c. X. p. 67. 



