OF BRTTTSH FUNGI. 161 



312. Parasitic on grass. Coloured. Perithecia fleshy, 

 immersed in a mycelioid stroma. Sporidia 

 linear. Epichloe, Fr. 



343. Stroma variable. Perithecia fleshy, pallid or 



coloured, ovato-globose and obtuse. Asci eight- 

 spored. Sporidia uniseriate, didymous, with 

 two globose and equal cells, at length separa- 

 ting. Hypocrea, Fr. 



344. Parasitic on fungi. Mycelium byssoid. Peri- 



thecia small, globose, papillate. Asci eight- 

 spored (rarely two to tour), without paraphyses. 

 Sporidia uniseriate, lanceolate or elliptic, rarely 

 obtuse, uniseptate, ejected in tendrils. 



Htpomtces, Tul. 



345. Stroma definite. Perithecia free, clustered or 



scattered, black or coloured, fleshy or horny. 

 Asci eight or many-spored. Sporidia of two 

 kinds. Nectria, Fr. 



346. Perithecia erect, contained in a coloured sac, 



which is free above. Ostiolum punctiform. 



Oomyces, B. and Br. 



346.* Perithecia cylindrical. Sporidia filiform 



Acrospermum, Tode. 



Order XXIX.-PERISPOPJACEI. 



Perithecia sub-globose, astomous, membranaceous, 

 often seated on threads, and appendiculate. Nucleus 

 never diffluent. 



Genera. 



347. "Without appendages. Asci clavate. Spores 



numerous. Peribporium, Fr. 



348. Central peridium attached to radiating fibres 



Secondary peridium ascigerous. Asci cylin- 

 drical. Lasiobotryb, Kze 

 M 



