190 LECAXORA. 



or less convex, coppery-brown areoles with a black edge becom- 

 ing at length elevated; apothecia smallish to middling, ap- 

 pressed ; disk chestnut-brown, soon convex, and finally exclud- 

 ing the thin, entire thalline margin. Spores ellipsoid, obtuse 



at the ends, ^ mic. Nyl. Scand. p. 170. L. atrocincta, Th. 



Fr. Scand. p. 268. 



Alpine rocks, White Mountains, Tuckerman. 1 have but 



little of our lichen, but consider it not to differ from one of the 

 specimens of Fr. Licli. Suec. n. 369, answering perfectly to 

 the description of L. atriseda ; from which last L. atrocincta, 

 Th. Fr. is mainly distinguished by the full evolution of the 

 black edge of the areoles ; this black edge being at first less 

 obvious, though plainly determined by the hypothallus common 



to both. The present is certainly a member of the badia- 



stock; it is interesting therefore that, according to Dr. Th. 

 Fries, the spermatia, in his cited plant return, in all respects, 

 to the ordinary type of those of the subfusca-group. 



19. L. badia (Pers.) Ach. ; thallus cartilagineous, rimose- 

 areolate, now sub-squamulose, or now warty; from ash-coloured 

 becoming lighter or darker olivaceous brown, often polished; 

 apothecia smallish to middling-sized, sessile, flat or finally con- 

 vex; dark-chestnut and black, shining; with a thick, persis- 

 tent margin which is entire, or at length flexuous-crenate, and 

 becomes concolorous with the crust, or blackens. Spores fusi- 

 form-ellipsoid, ^ mic. Syn. p. 154. Koerb. Syst. 138. Nyl. 



Scand. p. 170. 



Eocks, sub-alpine. Arctic America (Richardson), Hooker 

 I. c. 1823. White Mountains, TucJcerman. Tadousac, Canada, 



Drummond. The passage of true Lecanora badia ( Anz. Lich. 



Ital. n. 167) into Lecideoid conditions (Psora cenea, Anz. n. Ill, 

 & Psora Garovaglii, Anz. n. 112) appears scarcely questionable. 



The spermatia of this species are short and straight. 



20. L. phceobola, Tuckerm. ; thallus papillate-granulose, the 

 minute granules polished, olivaceous-brown; apothecia small- 

 ish, appressed; disk reddish-brown, shining, soon turgid, and 

 the thin, entire thalline margin disappearing. Spores fusiform- 

 ellipsoid, -j^ mic. Gen. Lich. p. 115. 



On bark of Libocedrus and Abies, California (Bolander), 



Tuckerman 1. c. 1872. The lichen has the aspect of a Bia- 



tora ; but much to associate it with L. badia ; with which it 

 agrees in the spermatia. The specimens are scanty. 



