KEY TO THE FAMILIES OP ORDER HYPOCREALES 301 



Perithecia superficial or slightly sunken, with a long neck. Ascospores one-celled 

 or several-celled, hyaline or colored, paraphyses usually present, asci 

 not dissolving at maturity. 



Family Ceratostomataceae 

 Ceratostoma, Ceratosphaeria. 

 Much like the foregoing but the paraphyses wanting and the asci dissolving at 

 maturity and the hyaline one-celled ascospores exuding in a drop at 

 the tip of a long neck. 



Family Ophiostomataceae 

 One genus Ophiostoma {Ceratostomella). 

 Perithecia in a cluster on a more or less well-developed subcortical stroma. 



Family Cucurbitariaceae 



(see Order Pseudosphaeriales) 

 Base of perithecium remaining sunk in the substratum at maturity. 

 Ostiole laterally compressed. 



Family Lophiostomataceae^ 

 Lophiostoma, Lophiotrema, Schizostoma. 

 Ostiole circular. Family Amphisphaeriaceae ^ 



Amphisphaeria, Caryospora, Winteria, Strickeria. 

 Perithecia remaining entirely enclosed in the substratum except the projecting 

 ostiole. No stroma present except in Glomerella. 

 Asci thickened at the top, with a distinct pore; ostiole mostly with a distinct 

 neck. Family Gnomoniaceae 



Gnomonia, Glomerella. 

 Asci not apically thickened and without pore; ostiole simple or with a low 

 papilla. Families Mycosphaerellaceae and Pleosporaceae 



(see Order Pseudosphaeriales) 

 Perithecia immersed in a stroma, mostly caulicolous. 

 Stroma in part consisting of remains of the host tissue. 



Asci with long tapering stalks, not deliquescent, ascospores mostly 

 allantoid. Family Allantosphaeriaceae 



Diatrype, Euttjpella, Anthostoma. 

 Stalks of the ascus dissolving early, ascospores ellipsoidal, fusoid, long 

 cylindrical, less often allantoid. 



Family Diaporthaceae 

 Diaporthe, Valsa, Leucostoma, Endothia. 

 Stroma consisting entirely of fungous tissue, eventually external, asci cylin- 

 drical, paraphyses abundant, ascospores dark. 



Family Xylariaceae 

 Hypoxylon, Daldinia, Poronia, Xylaria. 

 Perithecia in an endophyllous stroma, the perithecial walls well developed, 

 especially near the ostiole, where they pierce the clypeus-like portion 

 of the stroma. Leaf parasites. Largely tropical. 



Family Phyllachoraceae 

 Phyllachora, Ophiodothella. 



Key to the Families of Order Hypocreales 



Perithecia without stroma or external to a stroma; ascospores ellipsoid to cylin- 

 drical, one- to many-celled. Family Nectriaceae 

 Nedria, Gibberella, Sphaerostilbe, Scoleconectria, Thyronedria. 



2 Possibly belongs to the Order Pseudosphaeriales. \ 



