AND BRITISH AMEKICA. 71 



tate-vernicose, rugose at the central point. Seller. 1. c. Fr. 1. c. — 

 y. reticuluia, Schaer. ; th. reticulate-rugose above. Schar, I, c. Fr. 



1. c. 



Rocks in alpine districts. «, Newfoundland, Bory in herb. Willd. ! 

 — y. Bear Lake, and elsewhere in Arctic America, Hook.! (Parry's 

 Sec. and Third Voy.). 



5. U. ■polyphylla, HofTm. Th. coriaceous-cartilagineous, smooth, 

 corrugated, fuscous-black ; on the under side very black and glabrous ; 

 ' apoth. sessile, at first patellasform, marginate, becoming at length con- 

 vex, and concentrically plicate.' Fr. Lichenogr. p. 352. Gyrophora, 

 Hook. ! Br. Fl. 2, p. 217. Lichen, L. Gyrophora glabra, Ach. — 

 (3. deusta, Fr. ; th. thinner, furfuraceous-flocculose ; somewhat lacunose 

 and paler on the under side. Fr. 1. c. Umbilicaria deusta, Hoffm. 

 Gyrophora, Ach. Lichen, L. 



Rocks on mountains; a, alpine; — (5, descending. White Moun- 

 tains, infertile. Northward to Newfoundland, Pylaie, and Greenland, 

 Herh. Banks .' 



6. U. prohoscidea, DC, Stenh. Th. submembranaceous, reticulate- 

 rugose, olivaceous-fuligineous ; on the under side pale and fibrillose ; 

 apoth. somewhat elevated, orbiculate-patelteform, becoming at length 

 convex, very gyrose, or proliferous-papillate, somewhat excluding the 

 margin. Fr. Lichenogr. p. 354. Gyrophora, Ach. Hook. ! Br. Fl. 



2, p. 219. — (5. lomala, Ach. ; th. indurated, complicated, plicate-ru- 

 gose ; obsoletely fibrillose beneath. Ach. Syn. p. 65. Hook, in Rich. 

 I. c. p. 758, & Icon, t. 30, f. 4. — y. arclica, Ach. ; th. incrassated, 

 rugose ; glabrous beneath. Ach. I. c. Fr. I. c. 



Alpine and subalpine rocks. White Mountains ; and Chin of Mans- 

 field in the Green Mountains, fertile. Northward to Arctic America, 

 Rich. 



7. U. cylindrica, Ach. (sub Gyroph.). Th. subcoriaceous, rigid, 

 smoothish, livid, cinereous-pruinose, ciliated with elongated, rigid, ra- 

 mose, black fibres (or naked) ; on the underside somewhat pale-ochro- 

 leucous ; apoth. pedicellate, orbiculate-patelljeform, plane, becoming at 

 length hemispherical, gyrose-plicate, scarcely excluding the margin. 

 Gyrophora cylindrica, Ach. Hook.! Br. Fl. 2, p. 21S. Lie/ten, L. 

 U. prohoscidea, /S, Fr. Lichenogr. p. 356. 



Alpine rocks. A single specimen from Bear Lake, Herb. Hook. ! 



