OF ARTS AND SCIENCES. 265 



northern U. hirsuta. It was considered certainly distinct, in 1841, by 

 Montagne. Linnaeus cites the figure of Dillenius under his Lichen vel- 

 leu§, and his description includes also U. hirsuta, the differences in the 

 apothecia being disregarded ; but the specimen that I saw in the Lin- 

 nsean herbarium was the L. vellea of Sweden, which I have collected 

 abundantly in that country, and which seems to me very distinct from 

 the present. 



Sect. II. LiRELLAT^. Apothecia somewhat lirellseform, becoming at 

 length angulate-patellate, or finally crowded together in a hemispher- 

 ical, subimmarginate, lirellate tubercle. 



10. U. hyperiorea, HofTm. Th. coriaceous-membranaceous, papu- 

 lose-rugose, dark-olivaceous-fuscous, and blackish ; on the under side 

 lacunose, smooth, and fuscous-nigrescent ; apoth. appressed, originally 

 somewhat lirellseform, at length angular, substellate-multiform, plicate 

 and papillate, with an apparent margin. Fr. Lichenogr. p. 353. Gy- 

 rophora, Ach. Floerk. ! Berl. Mag. cit. Fr. 



Alpine and subalpine rocks (and perhaps a flocculose state, /5. deus- 

 ta., Enum. Lich. N. Amer., descending). White Mountains ; Chin of 

 Mansfield and other of the Green Mountains, fertile. Arctic America, 

 Rich. Rocky Mountains, Herh. Hook. ! In separating this section of 

 the genus from the other, I have endeavoured to indicate the features 

 of difference that seem, at the first view, to distinguish the lirellate 

 from the patellate apothecia ; but I am uncertain how far the proposed 

 characters are constant. The ternary division, incidentally proposed 

 by Fries (Lichenogr. p. 349), suggested the present; but my present 

 acquaintance with the species has not enabled me to adopt the former 

 entire. 



11. U. erosa, Hoffm. Th. cartilagineous, rigid, cribrose-reticulate, 

 at length rugulose, dark-fuscous-nigrescent ; on the under side papil- 

 lose-granulate, subfibrillose-lacerate in somewhat anastomosing ridges, 

 dark-fuscous and cinerascent ; apoth. originally somewhat lirellceform, 

 at length patellate, becoming convex and gyrose-plicate, and finally 

 substellate-multiform, and immarginate. Fr. Lichenogr. p. 354. Schcer. ! 

 Spicil. p. 93. 



Alpine rocks. White Mountains, fertile. Newfoundland, PyJaie. 

 Northward to Arctic America, R. Br., Hook. Northwest Coast, Men- 

 zies ! 



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