177 



published name Tophna to Taplirina, to avoid, as he 

 stated at the time, confusion with Taphria a genus of 

 insects, Tulasne in 1866 revised the genus Taphtnna of 

 Fries and made it include also the species of Exoascns. 

 Robinson followed Tulasne and Johanson also in 

 including all the species of the genera Ascomi/ces and 

 Taphrina and Ea-ooscus in the genus Taphrina, as ex- 

 tended by Tulasne. 



In my judgment the plan followed by Schroeter 1894, 

 in taking up the original genus Taphna Fries is by far 

 the best and is in accord with present practices. 

 Schroeter assigns to this genus all those spe- 

 cies whose asci at maturity are multisporic and to the 

 genus ExoiiscHH Eiickcl he assigns all those sjx^cies whose 

 asci at maturity are 8, or rarely 4, spored. In accord- 

 ance with the above statements our species shold be Avrit- 

 teu Taphria coerulescens (INlont. &Desm,) Schroeter, and 

 the following would be its synonomy : 



Ascomyces coerulescens Mont. & Desm. 1848. 



Taphrina coerulescens (Mont. & Desm.) Tulasne. 

 1866. 



Ascomyces quercus Cooke. 1878 . 



Ascomvces alutaceus Von Thuemen. 1879. 



Exoascus coerulscens (Mont. & Desm.) Sade- 

 beck. 1887. 



Taphria coerulescens (Mont. & Desm.) Schroeter, 

 1894. 



PREVENTION OF THE DISEASE. 



The fungus causing the disease now under considera- 

 tion is an annual and its mycelium does not perennate 

 within the tissues of the host as is true of many of the 

 closely related forms, such as the peach leaf-curl fun- 

 gus. The treatment of such fungi is very much more 

 readily carried out than is the case with perennial fungi, 



