LICHENES 455 



5. C. pule lU'Iluili, Ach. [Handsome] : Thallus membrana- 

 ceous, orbicular, round-lobed at the circumference, plicate-papulose 

 and dark-green above, under side paler and deeply lacunose ; apo- 

 thecia crowded, elevated ; disk urceolate, pale, the margin thin, 

 coarctate, very entire, finally rugulose. 



Hab. On trunks, &c. 



6. C 1 . s;it ii i ii in ii 111, Ach. [Lead-colored]: Thallus rosulate, 

 blackish-green, the under side glaucous and subtomentose ; lobes 

 broad, oblong, rounded, wavy, very entire; apothecia scattered, 

 somewhat plane, rufous, the margin thin, entire. 



Hab. On trunks, and rocks : frequent. 



614. L,EPTO V GHJUI, Fr. 



[Or. Leptos, slender, thin, or delicate ; characteristic of the genus.] 

 Apothecia rounded, becoming discoid open and scutellaeform, sub- 

 pedicellate, with a proper exciple. Thallus gelatinous-membrana- 

 ceous, subdiaphanous, texture cellulose. 



1. L. tremelloldes, Fr. [Tremella-like]: Thallus foliaceous, 

 very thin, smooth on both sides, or powdery above, lead-colored ; 

 lobes oblong, rounded, very entire ; apothecia scattered, elevated, 

 plane, rufous-fuscous, with a paler margin. 



Hab. On rocks, and trunks: common. 



2. I* lace rum, Fr. [Torn]: Thallus foliaceous, membrana- 

 ceous, very thin, glaucous-fuscescent ; lobes small, subimbricate, 

 lacerate-laciniate, denticulate-ciliate ; apothecia small, scattered, 

 subsessile, somewhat concave, rufous, with a paler margin. 



Hab. On mossy rocks, and bases of trees : common. 



3. L. I'ulvillus, Tuckerm. MS. [Little cushion] : Thallus pul- 

 vinate, fruticulose, much branched, blackish-green ; branches terete, 

 flexuose, entangled, more or less denticulate with short fibrillose 

 branchlets ; apothecia not seen. 



Hab. On rocks ; Serpentine ridge, near Unionville. 



Obs. This species has not yet been found in fruit ; and our plant 

 may possibly prove to be specifically distinct from the one to which 

 the name was originally given. 



TRIBE 2. EPHEBIDE V AE. 



Thallus filamentous, not gelatinous. 



615. THERMUTIS, Fr. 



Apothecia an orbiculate marginate sessile proper exciple, formed by 

 the coupling of several fibres of the thallus. Thallut composed of 

 entangled opaque blackish fibres. 



1. T. pamiosa, Fr. [Ragged]: Thallus blackish-green, of 

 terete very delicate entangled fastigicate short branchlets ; apo- 

 thecia minute, concave, obtusely margined, but becoming convex, 

 and, excluding the margin, of the same color with the thallus. 

 Hub. On long-exposed disintegrating Limestone rock& 



