OF ARTS AND SCIENCES. 253 



bling Lecidea enteroleuca, but with a different crust, and, I think, the 

 apothecia of the present genus. 



15. B. decolorans, Fr. Cr. tartareous, confused with the hypothal- 

 lus, areolate-granulose, glaucescent ; apoth. appressed, naked, from 

 flesh-colored becoming fuscous and black, with a thin, elevated, paler 

 margin ; finally convex and irregular, and the margin disappearing. 

 Fr. Lichenogr. p. 266. Lecidea, dein Lecanora granulosa, Ach. Le- 

 cidea decolorans, Floerk. Ach. Syn. 



On the earth, and decaying wood, in mountainous regions ; New 

 England. Northward to Arctic America, Rich. 



16. B. anomala, Fr. Cr. confused with the white hypothallus, at 

 length granulose, white-cinerascent ; apoth. becoming hemispherical- 

 globose, somewhat hyaline-livid, at length fuscescent and black, margin 

 very thin, evanescent. Fr. Lichenogr. p. 269. Lecanora commutata, 

 Ach. Syn. p. 149. 



Trunks, dead wood, &c. New York, Halsey. An obscure species. 

 Nomen omen. Fr. 



17. B. mixta, Fr. Cr. cartilagineous, confused with the hypothallus, 

 rugose-verrucose, milky-glaucescent ; apoth. adnata, exciple annular, 

 disk at first plane, pruinose, flesh-colored or livid, becoming at length 

 turgid, fuscous, and black, and excluding the obtuse margin. Fr.! Li- 

 chenogr. p. 268. Lecidea anomala, Ach. part. Tuckerm. Lich. N. E. 

 I.e. 



Trunks, and dead wood. New England. 



18. B. porphyritis, Tuclierm. Cr.subcartilagineous, smooth, chinky, 

 at length rugose, glaucescent (and greenish-sorediiferous) ; white with- 

 in ; apoth. elevated on a white thalline stratum which constitutes an 

 evanescent spurious margin, or sessile ; disk at first somewhat plane, 

 pruinose, with a thick, elevated margin, at length convex, and exclud- 

 ing the margin, fuscous-nigrescent. 



Trunks, in the mountains of Massachusetts and New Hampshire. 

 Near to B. mixta, but as that is one of the smallest, this is the largest 

 Biatora that I am acquainted with. Several apothecia sometimes oc- 

 cupy the same thalline stratum, as in B. ochrophsea and B. aurantiaca. 

 With age the apothecia become flexuous, and very large, a single ex- 

 ciple having sometimes a diameter of two lines. 



19. B. ochrophcBa, Tuckerm. Cr. subcartilagineous, thickish, gran- 



