160 THE FUNGI WHICH CAUSE PLANT DISEASE 



Key to Families of Hysteriales 



Ascocarps immersed; walls of the ascocarps 

 comiate with the membranous cover- 

 ing 1. HypodeTiiiatace8e,p. 160, 



Ascocarps at first immersed, enimp)ent, 



walls free 

 Walls membranous or coriaceous, black. 2. Dichsnacese, p. 162. 

 Walls thick, almost corky, gray or 



black 3. Ostropaces. 



Ascocarps from the first free 

 Walls carbonous, black; shield-shaped, 

 round, oval or more commonly 



linear 4. Hysteriaces, p. 163. 



Walls membranous or homy, brown, 



ascocarps vertical, clavate 5. Acrospennaceae. 



The third and fifth families contain no pathogens. 



Hypodermataces 



• 



Ascocarp flattened, rounded or elongate, rarely branched, 

 united to the substratum; opening by a slit; asci 4 to 8-spored; 

 paraphyses apically branched, the branches forming an epi- 

 thecium, or hooked or crimped. About fifty species, chiefly 

 saprophytes. 



Key to Genera of Hypodennataceae 



Spores elongate, rather broad 

 Spores 1-celled or by cross walls 2 to 

 many-celled 

 Spores 1-celled 

 Asci 8-spored, spores spindle-form 



Spores hyaline. i. Henriquesia. 



Spores brown 2. Farlowiella. 



Asci 4-spored, spores hyaline 3. Hypodennella, p. 161. 



Spores 2-celled, hyalme 



Apothecium black 4. Hypoderma, p. 161. 



Apothecium red 5. Angelinia. 



