336* BRITISH DISCOMYCETES. 



base, as if arising from a common stroma. In Tympanis 

 they approach Patellaria ; in Heterosphceria they simu- 

 late 8phoeria ; in Dermatea they have some likeness to 

 Helotium ; but attention to the texture and fructification 

 will prevent the possibility of error. 



Name from the typical genus Dermatea. 



ARRANGEMENT OF THE GENERA. 



I. Enccelia, Fries. 



II. Dermatea. Fries. 



III. Cenangium. Fries. 



IV. Tympanis. Fries. 

 V. Crumenula. De Not. 

 VI. Ephelis. Fries. 



KEY TO THE GENERA. 



Receptacles seated on an effused horny crust . . Eplielis. 



Receptacles corky or granular; flesh generally 



brown . . . . . . . . . . . . Dermatea. 



Receptacles coriaceous; sporidia filiform .. .. Crumenula. 



Receptacles coriaceo vis; sporidia oblong .. .. Encoelia. 



Receptacles horny or coriaceous, the base more or 

 less prolonged below (so that they are not globose, 



as in Heterosphxria) . . . . . . . . 1 



(Receptacles black, very rarely mealy . . . . Tympanis. 



\Receptacles rarely quite black, generally mealy . . Cenangium. 



GENUS I. ENCCELIA. Fries. 



Cups sessile, at first closed or nearly closed, at length 

 open, concave, more or less coriaceous ; externally lur- 

 furaceous or naked ; sporidia 8, oblong ; epiphytal. 

 (Plate X. fig. 64.) 



Name tv, within, and KOI\OG, hollow 



Only three British species. 



KEY TO THE SPECIES. 



Externally blackish . . . . . . . . . . 1 



Externally pale tan .. .. .. .. .. furfuracea. 



, (Externally rugose .. .. .. .. .. fascicularis. 



' \Externally verrucose . . . . . . . . . . Bloxami. 



1. Encoelia fascicularis. (A. and S.) 



Csespitose, rarely solitary, sessile, leathery mem- 

 branaceous, irregular, rugose, blackish ; externally rather 

 mealy ; hymenium concave, dark bay-brown, becoming 

 paler ; asci cylindraceo-clavate ; sporidia 8, oblong, 



