192 LECANORA. 



flesh-coloured, and rufescent, thin; as is the erect, entire, or 

 crenulate, finally excluded margin. Spores oblong- ellipsoid, 

 ^- mic. Nyl. Scand. p. 163. 



a. thallus thin, cartilagineous ; apothecia small to very small, 

 crowded, sessile, flattish; 'the persistent thalline margin sub- 

 entire, or crenulate, or deliquescent and powdery. Parmelia 



varia, a, pr. p. Fr. L. E. p. 156. Tuck. exs. n. 92. Th. Fr. 

 .Scand. p. 259. 



b. polytropa, Nyl. ; thallus thickened, becoming sub-tartare- 

 ous, rimose-areolate, or now granulate and heaped, or sub- 

 squamulose, or obsolete; apothecia at length middling-sized, 

 sessile, flat ; concolorous, or yellowish-flesh-coloured, finally 

 flexuous ; with a very entire margin, which is at length ex- 

 cluded. Nyl. 1. c. Farm, varia v. polytropa, Fr. L. E. p. 158, 



jpro p 



c. intricata, Nyl. ; areoles distinct, flat, and sub-effigurate ; 

 .apothecia of the size of those of a, adnate; soon black and 

 lecideoid. Nyl. I. c. 



d. symmicta, Ach. ; thallus thin ; the apothecia of the size of 

 those of a, soon convex and biatoroid; disk pale-yellowish to 

 pale-brick-coloured, and rufous, and blackening, quite exclud- 

 ing the 'thin, entire margin. Fr. L. E. I. c. Nyl. I. c. 



e. scepincola, Fr. ; thallus thickened, glebous-granulate ; apo- 

 thecia of the size of the last, semi-immersed, convex, immargi- 



nate, reddish, olivaceous, and black, slightly pruinose. Fr. 



L. E. 1. c. Nyl. I, c. 



a, common on trees, dead wood, and stones, northern and 

 middle States, Mulilenberg Catal. 1818. Ohio, Lea. Illinois, Hall. 

 Maryland, Tuckerman. Carolina, Ravenel. Texas, Wright. Cal- 

 ifornia, Bolander. Oregon, Hall. 6, c, alpine and sub-alpine 



rocks, Arctic America (Richardson), Hooker I. c. 1823. White 



Mountains, Tuckerman. d, as a, common throughout. e, 



dead wood, common. 



24(&). L. Cupressi, Tuckerm. in litt. ; thallus granulate, 

 becoming densely verrucose; greenish-glaucescent ; apothecia 

 smallish to middling-sized, sessile, flattish; the finally turgid 

 disk naked, from bright-lemon-coloured at length brownish- 

 orange ; the incurved margin crenulate. Spores oblong, ^ 

 mic. 



