OF ARTS AND SCIENCES. 251 



Stipes rather short, somewhat compressed, corticate with the ascending 

 granules of the crust or naked, often subdivided at the apex. Fr. Li- 

 chenogr. p. 257. Bceomyces rupesfris, Ach. Lich. p. 573. B. nifus, 

 Wahl. B. Byssoides, ScJicbt. — a. Fr. ; granules, of the crust subsqua- 

 maceous, crenulate (and deliquescent), greenish-glaucous. Fr. I. c. — 

 ^. ritpesfris, Fr. ; cr. thin, smoothish, subcontiguous (or powdery); 

 apoth. smaller. Fr. I. c. Bceom. rupestris, Pers. — y. lignatilis, Fr. ; 

 cr. rugose, cinereous-glaucescent ; apoth. subsessile, fuscous-black. Fr. 

 I. c. BcEom. lignorum, Pers. 



Common in mountainous districts : a, sterile sandy and clayey soils ; 

 slides, banks of streams, and road-sides, in the mountains of New Eng- 

 land. — /5, rocks in mountain forests, New England. New York, HaU 

 sey. — y, decaying wood, in similar situations with the last, apothecia 

 almost sessile. The three varieties occur often in close neighbourhood 

 at the White Mountains. This species, Stereocaulon Fibula, and S. 

 aciculare illustrate the connection of Stereocaulon with the sessile Bi- 

 atorse. The difference of structure, indicated by Fries as generically 

 distinguishing Baeomyces roseus from this and the last species, referred 

 to Beeomyces by Acharius, has been further, illustrated by Dr. Kiittling- 

 er in Allg. Bot. Zeit. 1845, 1. c. 



Sect. II. Thallus effuse, uniform. 



7. B. icmadophila, Fr. Crust tartareous, granulate, greenish-glau- 

 cous; hypothallus white; apothecia (large) softish, incarnate, exciple 

 cupular, with a thin, evanescent margin. Fr. Lichenogr. p. 258. Le- 

 cidea, Ach. Bceomyces, DC. 



Decaying wood in mountain forests, and on the earth ; ascending to 

 alpine districts ; New England. New York, Torrey. Pennsylvania, 

 MuJil. Arctic America, Rich. Apothecia sometimes a little stipitate 

 in ours, as in the European Lichen. 



8. B. vernalis, Fr. Cr. of minute, glaucescent granules, arising 

 from a membranaceous, whitish hypothallus ; apoth. at length subglo- 

 bose, clustered, flesh-colored, and fulvous-ferrugineous. Lecidea ver- 

 nalis, Borr. in Hook. Br. Fl. 2, p. 183. L. luteola, Ach. 



Trunks in mountain forests, growing over mosses ; New England. 

 New York, Halsey. Arctic America, Rich. 



9. B. pineti, Fr. Cr. very thin, granulose, greenish-glaucescent ; 

 apoth. (minute) sessile, whitish ; disk becoming at length yellowish- 



