44 NATURAL HISTOEY BULLETIN 



Pezizine^e. 



Receptacle fleshy or waxy, rarely gelatinous; ends 

 of paraphyses free. 

 Peridium and hypothecium of nearly the same 

 structure. 

 Receptacle open from the first, convex, peri- 

 dium wanting or poorly developed. . 4. Pyronemaceae 

 Receptacle at first concave; peridium devel- 

 oped, fleshy. 

 Asci at maturity forming an even layer. . 5. Pezizaceae 

 Asci at maturity emergent. ... 6. Ascobolaceae 



Peridium forming a more or less well differen- 

 tiated layer. 

 Peridium composed of elongate, thin, bright- 

 walled cells, parallel with each other 



forming the pseudo-parenchyma. . . 7. Helotiaceae 

 Peridium composed of roundish or angular, 

 thin, dark-walled cells, forming a 



pseudo-parenchyma 8. Mollisiaceae 



Receptacle leathery or cartilaginous; ends of para- 

 physes united to form an epithecium. 

 Receptacle free from the first, never inclosed 



in a membrane 9. Patellariaceae 



Receptacle at first submerged, later breaking 

 through the epidermis, cup- or beaker- 

 shaped often at first inclosed in a mem- 

 brane 10. Cenangiaceae 



Phacidiine^e. 



Fleshy, white, bright colored, never black, sur- 

 rounded by the torn edges of the epidermal 

 covering H- Stictidaceae 



Hysteriixe.e. 



Apothecia free, carbonaceous, black, round or most- 

 ly linear 12. Hysteriaceae 



KEY TO THE GENERA. 



1. Geoglossace.e. 



Receptacle globose or pileate, margin free. . . . Leotia. 

 Receptacle spoon-shaped, adnate with the stem. . . Spathularia. 



2. Helvellaceje. 

 Pileus hollow entirely or in the upper part only ; cavity 



of pileus continuous with that of the stem. 

 Upper surface of the pileus marked by deep pits. Morchella. 



