106 PELTIGERA. 



On the earth. Pennsylvania, Muhlenberg Catal. 1818. New 

 York, Torrey. Vermont (argillaceous soil), Russell Canada, 

 Macoun. Greenland, J. Vahl. Behring's Straits, Wright. N. W. 

 Coast, Menzies, etc. Rocky Mountains, E. Hall. New Mexico, 

 Fendler. 



\/ 



2. P. aplithosa (L.) Hoffm.j thallus ample to large, coriace- 

 ous, softish, smooth ; from apple-green becoming glaucescent ; 

 the broad, rounded, repand lobes besprinkled with appressed, 

 creuate, brown warts ; and beneath reticulated with blackening 

 veins which disappear finally in a close nap ; sparingly fibrillose ; 

 apothecia on somewhat extended lobules, middling to ample, 

 round; disk reddish-brown. Spores acicular, 4-8-locular, 4 ^ 

 mic. Fr. L. E. p. 44. Tuckerm. Lich. exs. n. 9. 



Eocks, among mosses, and on the earth, common in mountain 

 forests. Pennsylvania, Muhlenberg Catal. 1818, and the north- 

 ern States. Lake Superior shores, Agassiz, and northward 

 throughout Arctic America, Richardson, etc. Ohio, Lesquereux. 

 Rocky Mountains, Hall. N. W. Coast, Scouler, etc. Mountains 



of North Carolina, Ravenel. A rather reduced and thinner 



state (f. minor, Tuckerm. exs. n. 102), with pale, conspicuously 

 brown-reticulated under side, is common here, and is also Euro- 

 pean. The apothecia occur now marginal (f. marginalis, 



Tuckerm. Gen. p. 37) as in the preceding species ; the specimens 

 (otherwise reduced) being from Behring's Straits, Wright; and 

 the alpine regions of the Rocky Mountains, Hall. 



* * Gonimous layer constituted of gonimia. 



3. P. horizontalis (L.) Hoffm. ; thallus ample, coriaceous, 

 smooth ; from glaucous-greenish becoming cinereous-rufescent ; 

 reticulated beneath with blackening veins which soon pass into a 

 continuous, close nap ; sparingly fibrillose ; apothecia on abbre- 

 viated lobules or sub-marginal, middling-sized, transversely ob- 

 long, flat, horizontal ; disk reddish-brown. Spores fusiform, 4- 



locular, pale-brownish, ^ mic. Fr. L. E. p. 47. Tuckerm. 



Lich. exs. n. 11, 12. 



Moist rocks among mosses. Pennsylvania, Muhlenberg Catal. 

 1818, and throughout the middle and northern States. Canada, 

 Macoun. Ohio, Lea. Rocky Mountains, Hayden. Shores of 

 Behring's Straits, Wright. New Mexico, Fendler. Mountains, 

 of North Carolina, Ravenel. 



