224 THE FUNGI WHICH CAUSE PLANT DISEASE 



oped on the upper surface of 



the young stroma 18. Xylariacea, p. 284. 



Families Nos. 1, 6, 7, 8, 17 are saprophytes on plants and 

 animals. 



Sordariacese (p. 222) 



Perithecia superficial or deeply sunken in the substratum, often 

 erumpent at maturity, thin and membranous to coriaceous, slightly 

 transparent to black and opaque; stroma usually absent, if present 

 the perithecia immersed in it with projecting papilliform beaks; 

 asci usually very delicate, cylindric, 8-spored; spores usually 

 dark-colored; paraphyses abundant. 



A small order, chiefly dung inhabiting. 



Key to Genera of Sordariaces 



Spores continuous 

 Without a stroma 



Neck of the perithecimn hairy 1. Sordaria. 



Neck of the peiithecium \nth black 



spines 2. Acanfhorhynchus, p. 224. 



With a stroma 3. Hypocopra. 



Spores 2 or more celled 

 Spores 2-celled 



Spores hyaline 4. Bovilla. 



Spores dark-brown 5. Delitschia. 



Spores 4 to many-celled 



Stroma absent 6. Sporormia. 



Stroma present 7. Sporormiella. 



Spores muiiform; stroma present 8. Pleophragmia. 



Acanthorh3mchus Shear ^°^ 



Perithecia scattered, submembranous, buried, beaked, the beak 

 with non-septate spines; asci opening by an apical pore; paraphyses 

 present, septate; spores continuous, brownish-yellow. 



There is a single species, A. vaccinii Sh.**' 



Amphigenous: perithecia subglobose to flask-shaped, scarcely 

 erumpent, 120-200 n in diameter, neck stout, exserted, ^Jz-^U the 

 length of the peritheciiun; spines 50-70 x 8-9 /x; asci subelliptic 

 to somewhat clavate, subsessile, 120-155 x 24-44 /t; spores oblong- 



