230 PROCEEDINGS OF THE AMERICAN ACADEMY 



red, naked on both sides ; laciniae somewhat discrete, linear, convex, 

 contiguous, flexuous ; apoth. of the same color, very entire. Fr. Li- 

 chenogr. p. 114. 



Rocks and stones near the sea, fertile ; New England. Northward 

 to Newfoundland, Pplaie, Point Lake, &c., Rich., and Melville Island, 

 R. Br. 



47. P. murorum, Ach. Th. crustaceous, adnate, contiguous, in the 

 circumference radiose-plicate, pale yellow ; white underneath ; apoth. 

 sessile, disk naked, dark yellow, with a thin, entire, somewhat flexuous 

 margin. Fr. Lichenogr. p. 115. — ^. miniata, Fr. ; th. verrucose, less 

 and more narrowly radiose, naked, vermilion-colored. Fr. I. c. Leca- 

 nor a, Ach. 



Rocks and stones near the sea. New England, fertile. — /?, Penn- 

 sylvania, Muhl. Arctic America, Rich. 



Subsect VII. Psora, Fr. 



48. P. niolyhdina, Wahl. Thallus crustaceous, areolate-verrucose, 

 radiate-plicate, dark-fuscous; white beneath; lacinise of the circumfer- 

 ence linear ; apothecia innate, disk urceolate, blackish-fuscous, margi- 

 nate, with a tumid thalline margin. Fr. Lichenogr. p. 126. 



Rocks. Greenland, Fries. 



49. P. cervina, Sommerf. Th. areolate-squamaceous ; the scales 

 crustaceous, subpeltate, repand or lobed, from greenish becoming livid- 

 chestnut ; on the under side white; apoth. at first immersed, margi- 

 nate, at length protuberant, disk rufous-fuscous. Fr. Lichenogr. p. 127. 

 — /3. squamulosa, Fr. ; th. chestnut-tawny; apoth. naked, thalline mar- 

 gin thin or wanting. Fr. I. c. 



Rocks. White Mountains. Northward to Arctic America, Rich. 



50. P. chrysomelcBna, Ach. (sub Lecanora). Th. crustaceous, are- 

 olate, yellow ; areolae flat, submembranaceous, somewhat lobate, here 

 and there discrete ; apoth. appressed, disk plane, sanguineous-black, 

 thalline margin elevated, subrugose, at length flexuous. Ach. Syn. p. 

 148. 



North America (Pennsylvania.'), Muhl., Ach. 



Sect. IV. Thallus crustaceous, uniform. 

 Subsect. VIII. Patellaria, Fr. 



51. V.pallescens, Fr. Crust subtartareous, rugose-granulate, glauces- 



