ORCADELLA 203 



Schvveinitz and reports it for Ohio, but we find it in no American 

 collections. 



B. ORCADELLACE^ 



Sporangia distinct, minute, long stipitate, opening above by a dis- 

 tinct lid. 



A single genus, — 



Orcadella Wingate 



1889. Orcadella Wingate, Proc. Phil. Acad., p. 280. 



Sporangia furnished with rigid, unpolished stipes, blending above 

 with the substance of the thick unpolished walls; the operculum thin, 

 delicate, membranaceous. 



A single species, — 



1. Orcadella operculata Wingate. 



Plate XII., Fig. 11. 

 1889. Orcadella operculata Wingate, Proc. Phil. Acad., p. 280. 



Sporangia scattered, gregarious, ellipsoidal, ovoid, obconical or 

 nearly globose, dull brown or blackish, the wall simple, thick, coarse, 

 at the top replaced by a delicate, thin, yellowish, iridescent, lustrous 

 or vernicose membrane which forms a circular, smooth, or wrinkled 

 lid, soon deciduous; stipe of varying height, rough from deposit of 

 plasmodic refuse; spores, in mass yellowish, globose, smooth, 8-11 u. 



This curious little species, well described by its discoverer, appears 

 to be very rare. At least it is seldom collected ; overlooked by reason 

 of its minuteness. It is a stipitate licea, or a lid-covered cribraria; 

 perhaps nearer the former. It affects the bark of species of Quercus, 

 and seems to be associated there with Clastoderma debaryanum. 

 N. A. F., 2497. 



Pennsylvania, Maine. 



C. TUBIFERACE.^ 



Fructification asthalioid or of distinct sporangia ; sporangia well de- 

 fined, tubular, often prismatic by mutual pressure, seated on a com- 

 mon, well-marked hypothallus, at length dehiscent by the irregular 



