226 ASCOMYCETES. 



the larva of which bores canals in the wood of alders, birches, 

 and willow r s, causing them to die. 



Most of the other species of Valsa cause only leaf-spot, or 

 occur on dead leaves. 



Anthostoma. 



The perithecia are embedded in the substratum or stroma, 

 and have generally long necks. The asci contain eight brown 

 or black, oval, unicellular spores. Paraphyses are always absent. 



Anthostoma xylostei (Pers.) occurs on living and dead 

 branches of Lonicera Xylosteum. (Britain). 



Anthostomella pisana Pass, lives on leaves of Chamerops humilis and 

 kills them. 



DIATRYPEAE. 



Calosphaeria. 



No stroma is formed, the perithecia arising singly or in 

 groups in the bark under the periderm ; they have often long- 

 beaks. The asci are club-shaped, and frequently long-stalked ; 

 they contain eight or more spores, which are little, unicellular, 

 and somewhat curved. 



Calosphaeria princeps Tul. occurs on living branches of 

 cherry and plum. (Britain and U.S. America). 



Quaternaria Personii Tul. has black perithecia and, according to Will- 

 komm, causes death of twigs of beech. (Britain and America). 



MELANCONIDEAE. 



Aglaospora. 



The perithecia are beaked and embedded in the stroma. The 

 spores are furnished with appendages. 



Aglaospora taleola Tul. 1 (Diaporthe talcola Fries, and pro- 

 bably nearly related to those Mclanconi with appendages on 

 their spores, e.g. Mel. thelebola, previously known as Aglaospora 

 thel. Tul.). (Britain and U.S. America). This fungus causes 

 a disease of twigs and young stems of oak which have not 



1 R. Hartig, " Eine krebsartige Rindenkrankheit d. Eiche," Forstlich-naturwlss 

 Zdttchrift; 1893. 



