THE DISCOMYCETES OF EASTERN IOWA. 



245 



c — Peridium and hypothecium of nearly the 

 same structure, 

 d — Receptacle open from the first, convex ; 



peridium wanting or poorly developed 

 d — Receptacle at first concave; peridium 

 developed ; fleshy, 

 e — Asci at maturity forming an even 



layer, not emergent 

 e — Asci at maturity emergent 

 c — Peridium forming a more or less well dif- 

 ferentiated layer. 



d — Peridium composed of elongate, thin, 

 bright-walled cells parallel with each other 

 forming the pseudo-parenchyma 

 d — Peridium composed of roundish or angu- 

 lar, thin, dark-walled cells forming the 

 psudo-parenchyma .... 

 b — Receptacle leathery or cartilaginous; ends of 

 paraphyses united to form an epithecium. 

 c — Peridium wanting or poorly developed 

 c — Peridium well developed, mostly leathery, 

 d — Receptacle free from the first, never in- 

 closed in a membrane 

 d — Receptacle at first submerged, later 

 breaking through the epidermis, cup- or 

 beaker-shaped often at first inclosed in a 

 membrane ..... 



A — Receptacle seated on a well developed stroma 

 consisting of strands or knob-like structures. 

 b — Stroma consisting of strands; receptacle on 



ends of strands ..... 



b — Stroma consisting of knob-like structures; 



receptacles imbedded .... 



Pyronemacec 



Pezizacea 



jlsioholacccc 



Helotiacece 



Mollisiacccc 

 Celidiacece 



Patella) iaccic 



Cenangiace.ee 



Cordieritidaceez 



Cyttariacicc 



I'YRONEMACE^ 



A — Receptacle seated on loose hyphie ; hypothecium 

 very poorly developed; peridium wanting; asci 

 free on the receptacle. 



b — Epispore colored ..... 

 b — Epispore colorless .... 



A — Receptacle seated on a spider-web-like, or felt- 

 like mass of hyphae; hypothecium well developed, 

 fleshy ; peridium poorly developed, 

 b — Spores elliptical ..... 

 b — Spores spherical . . ... 



Ascodesmis 

 i Xscocalathium 



Pyronema 

 Pyronemella 



