IOWA DISCOMYCETES 



45 



Upper surface of pileus spirally folded or convo- 

 lute GYKOiOTBA- 



PDeus membranaceous, bell-shaped or ragged, attached 



to the stem by the central part only. . . . Helvzixa. 



3. Ehizixace^. 



Spores globose, root-like processes wanting. . . Sph-EBOSOMa 



4. Pykonemace^. 



Beceptacle seated on a spider-web-like, or felt-like mass 

 of hyphae. hypothecium well developed, fleshy: 

 peridium poorly developed Ptkoxema 



5. Pezizace^. 



Spores globose. 



Eeceptacle externally clothed with bristly hairs. Sph-EKOSPORa. 

 Eeceptacle externally smooth or nearly so, not 

 bristly. 

 Eeceptacle large, cup-shaped, brown. . . Detoxia. 

 Eeceptacle small, nearly plane or disc-shaped. Baklea. 



Spores elliptical, blunt, rarely pointed. 

 Eeceptacle externally hairy. 



At first buried in the ground, margin splitting. Sakcospbuera. 

 Xot buried in the ground, margin remaining 



even Lachxxa. 



Eeceptacle smooth or nearly so externally. 

 Cups or discs regular in outline. 

 Juice colorless. 



Spores smooth or rough, not reticulate. 

 Plants entirely sessile. 



Large cup-shaped Peziza. 



Small disc-shaped. 



Plants bright colored, spores hyaline. Hcmakia. 

 Plants dark colored, spores brown. Phjeopezia. 

 Plants stipitate. 

 Stem stout, short. 



Stem even, not grooved. . . . Geopyxis. 

 Stem uneven. with longitudinal 



grooves Acetabula. 



Stem long, slender Macropodia. 



Spores reticulate, with a net work, exter- 

 nally AXEURIA. 



Juice milky Galactixia. 



Cups irregular, split on one side. . . . Otidea. 



