LICHBNB3 449 



SECTION 1. PATELLATAB. 



Apothecia, orbiculato-patellaeform ; disk at length clunky, plicate, or proliferous 

 papillate. 



1. V. OillOllii, Tuckerm. [Dillenius's]: Thallus coriaceous, 

 rather rigid, smooth, glaucous-fuscescent becoming dark-fuscous, 

 under side black, and closely hirsute with short black crowded 

 fibres ; apothecia convex, at first orbicular and concentrically 

 plicate, finally lirellate, with a thin channelled margin. 

 Hob. On rocks, in mountainous districts. 



Obs. I have not yet met with this species within our limits ; but 

 have seen a specimen obtained near the Schuylkill. It, and several 

 other species, are abundant a few miles further north. This genus 

 furnishes the celebrated " Tripe de roche" (Tripe of the Rocks), of 

 the Canadian and Western Hunters, to which they are often 

 obliged to resort, when other means of subsistence fail. When pro- 

 perly prepared for the table, it is said to be a tolerable substitute 

 lor "Tripe," which it also somewhat resembles. 



6O4. OPE'GRAPHA, Humb. 



[Or. Ope, hollow, and graphe, writing; from the lines of the apothecia.] 

 Apothecia somewhat lirellaeform, margined by a free, somewhat 

 carbonaceous, proper exciple ; disk channelled, at first closed by 

 the inflected-connivent margin, becoming open, indurated and horny. 

 Thallus crustaceous. 



gl. Apothecia superficial, destitute of a thalline margin. 



1 . O. atra, Pers. [Black] : Crust innate in the matrix ; apothe- 

 cia emergent-superficial, slender, shining, acute; margin of the 

 subentire exciple thin; disk linear, channelled, naked, horny 

 within. 



Var. b. abbrevidta, Fr. apothecia abbreviated, irregular, often radiately disposed. 



Var. c. maculdris, Fr. apothecia dilated into somewhat radiate immarginatc 

 maculae, and confluent. 

 Hab. On trees. 



2. Apothecia erumpent, coronate for the most part with a thalline margin. 



2. O. script a, Ach. [ Written] : Crust innate, becoming ex- 

 posed, uneven, pulverulent; apothecia immersed, erumpent, with 

 a raised thalline margin, the proper margin tenuescent, smooth ; 

 disk linear, at first caesious-pruinose. 



Var. a. Umitdta, Schaer. apothecia emergent, scattered, various. 



Var. b. recta, Schaer. apothecia immersed, straight, parallel, somewhat dilated. 



Var. c. serpentina, Schaer. apothecia immersed, long, flexuous, the thallioe 

 margin tumid, evanescent. 



Hab. On trees : Var. c. frequent on Cherry-trees where the elongation of th 

 apothecia seems to be occasioned by the transverse expansion of the almost horny 

 outer bark. 



3. O. polymorpha, Ach. [Many-form]: Crust somewhat 

 pulverulent, whitish-cinerascent, or very white ; apothecia rounded, 

 or oblong, irregular, without apparent proper margin, from plan* 

 becoming tumid and elevated-punctate, angulate, or stellate-ramulose, 

 caesious-pruinose, with more or less thalline margin. 



Setb. On trunke of Ash ( Fraxinus sambucifctia). 



