258 PROCEEDINGS OF THE AMERICAN ACADEMY 



Rocks and stones in mountainous districts ; White Mountains. 



11. L. fusco-atra, Fr. Areolae of the crust cartllagineous, applanate, 

 olivaceous-fuscescent and fuscous, angulate, smooth and somewhat pol- 

 ished (or becoming dull and pallescent) ; apoth. produced from the 

 hypothallus, appressed ; disk plane, at first cinereous-pruinose, at length 

 naked, with a thin, somewhat acute, at length flexuous margin ; but the 

 margin disappearing with age, and the apothecia often finally heaped 

 and conglomerate. Fr.Lichenogr.p.3l6. L. fumosa, Ach. L. athro- 

 carpa, Ach. 



Rocks and stones in mountainous districts. New England. New 

 York, Halsey. Arctic America, Rich. 



12. L. conjtuens, Schser. Cr. rimose-areolate, opake, cinerascent- 

 smoke-colored ; apoth. produced from the crust, appressed, somewhat 

 contiguous (often confluent) ; margin not elevated, obtusish ; disk al- 

 ways naked, very black, within cinerascent. SchcBr.! Spicil. p. 144. 

 Fr. Lichenogr. p. 318. 



Rocks and stones in mountainous and alpine districts ; New Eng- 

 land. New York, Halsey. Arctic America, Rich., Hook. 



13. L. Mario, Schser. Areolse of the crust verrucose, shining, of a 

 yellovvish-copper-color, radiant at the circumference ; apoth. produced 

 from the thick, determinate, black hypothallus, minute, depressed, 

 plane, becoming gyrose-plicate with age ; margin thin ; disk always 

 naked, black within. Fr. Lichenogr. p. 319. Schcer. Spicil. p. 133. — 

 /5. coracina, Schser. ; crust (from the pred'ominance of the, hypothal- 

 lus) cinerascent-black. Schcer. ! I. c. Fr. I. c. 



Rocks in alpine and subalpine districts ; White Mountains. 



14. L. geographica, Schaer. Cr. of somewhat confluent, bright-yel- 

 low areolse ; apoth. produced from the hypothallus, blackish within ; 

 margin of the cupular exciple thin ; disk naked. Fr. Lichenogr. p. 326. 

 SchcBr.! Spicil. p. 124. — «. atr o-vir ens, Schser.; areolae verrucaeform, 

 scattered in the hypothallus ; apoth. immixed. Fr. I. c. Sch^r. I. c. — 

 ^. contigua, Schasr. ; areolae applanate, confluent in a somewhat contigu- 

 ous, chinky crust ; apoth. immersed. Fr. I. c. Schcer. I. c — y. alpicola, 

 Schaer. ; areolae applanate, coalescent and large, somewhat rugose, inter- 

 ruptedly covering the hypothallus; apoth. innate. Fr. I. c. Schcer. I. c. 



Rocks and stones (granite and mica-slate), in alpine and subalpine 

 districts, and at lower elevations, in the mountains of New England. 

 Newfoundland, Pylaie. Northward to Arctic America, Rich. 



