32 IOWA ACADEMY OF SCIENCE 



Jolianson.^" Sadebeck, in one of his earlier papers on Taphrina, makes 

 mention of T. polyspora?^ and in a subsequent paper gives a good de- 

 scription.^- 



The following comments on Taphrina have been furnished me by 

 Dr. Farlow: 



"The different species of Taphrina and Exoascus on maples are 

 somewhat confusing. E. acericola C. Massalonga was described in 

 Malpighia VIII, 121, 1894, but his variety Pseudoplatani of that species 

 had been previously referred to Taphrina polyspora as a variety." 



"Taphrina polyspora (Sorokin) Johan. was described a good many 

 years ago as an Ascomyces by Sorokin. if I remember correctly, and 

 was called Taphrina polyspora by Johanson in 1887. The Taphrina 

 aceris of Linhart is a synonym of this species'. Taphrina acerina Elias- 

 son, a more recent species, dates from 1895." 



Sadebeck places the form on Acer pseudoplatanus as a variety of 

 polyspora the variety pseudoplatani. This form having asci from- 16- 

 24x10-12m in diameter. Producing like the species an abundance of 

 yeast-like conidia occuring in the asci. According to Massalonga, the 

 asci only develop on the lower surface of the leaf. This variety is also 

 found in Italy, while the species occurs in southern Russia, Hungary, 

 and Scandinavia. 



The Taphrina acerina was described and figured by Eliasson."' The 

 mycelium is subcuticular, the apex of the asci is roundish or truncate: 

 15-23-" long by 9-12*" wide, crowded, the stalk cells not entering into 

 the epidermis, round at the base 79m by 12-15-" ; aseospores globose, 

 415/^ in diameter. This was also found upon Acer platanoides in 

 Upsala, Sweden, and evidently is distinct from the Taphrina lethifer 

 of Peck. 



The characters of the disease upon Acer grandidentatum are as fol- 

 lows: The leaves are yellowish, then finally becoming blackish and 

 fall ; they are not crinkled. The asci usually occur upon the lower surface 

 of the leaves although in some cases upon the upper; the mycelium is 

 perennial in the buds forming a subcuticular mycelium ; densely crowd- 



^''Ofv. af. Kgl. Vet.-Akad. Forhandl. Stockholm 1885; 1:41 Bihang. Till. Kgl. 

 Svenska Vet.-Akad. Handlingar. 13:19, No. 4. 



^^Kritischen Untersuchungen. Jahrbuch der Hamburgischen Wissenschaft- 

 lichen Anstalten. 8:3.5. 



'^Die parasitschen Exoasceen. Jahrbuch. der Hamburgischen Anstalten. 

 10:76. 



^''Bihang Tilk Svenska Vet.-Akad. Handlingar. 20:3: No. 4. PI. 1. 



