186 LECANORA. 



b. cancriformis, Tuck. ; tliallus thickening and finally verru- 

 cose; apothecia middling to ample, turgescent; with a livid- 

 flesh-coloured and reddish, gray-pruiuose disk, and a thick, 

 flexuous, and at length crenate and lobate margin ; now finally 



proliferous. Verrucaria cancriformis, Hoffm. D. Fl. p. 171. 



Lecanora ccesio-rubella, Ach. L. U. p. 366 ; Syn. p. 167. 



c. angulosa, Hoffm. ; apothecia small, soon crowded and 

 angulate-difform ; the livid-brownish disk glaucous-pruinose. 

 L. albella v. angulosa & v. cinerella, Auctt. 



Trees and rails, throughout North America, Hoffmann I c. 

 1796. Northern and middle States, Muhlenberg. Maryland, 

 Tuckerman. Virginia and Carolinas, Curtis ; Ravenel. Georgia, 

 Havenel. Alabama, Beaumont. Florida, Chapman. California, 

 Bolander. Oregon, Hall. Arctic America, Richardson. 



10. L. miculata, Ach. ; thallus thin, granulate, dirty- white ; 

 apothecia flat or with age a little convex, brownish-glaucous, 

 pruinose, the persistent, tumid thalline margin at length flexu- 

 ous and crenate. Syn. p. 164. 



Trees, North America (Muhlenberg), Ach. I. c. 1814. 



Quite unknown to me. I associate with it provisionally how- 

 ever a not uncommon Lecanora (Pennsylvania and Virginia, 

 Myself; Ohio, Lea ; Arkansas, Peters j South Carolina, Eavenel ; 

 Louisiana, Hale ; Texas, Wright), the granulate- verrucose, glau- 

 cescent thallus of which, as well as the flattish, reddish-brown, 

 pruinose apothecia may keep it apart. Apothecia of this l mm - 2, 

 to 2 mm - wide ; spores ^^ mic. 



11. L. frustulosa (Dicks.) Mass. ; thallus tartareous, gle- 

 bous-sub-squamaceous, the roundish, turgid warts becoming 

 flattened and effigurate ; either dispersed, or crowded and sub- 

 imbricate; from glaucous- now yellowish - white ; apothecia 

 smallish to middling, sessile ; disk reddish-brown and blacken- 

 ing, soon convex, naked ; the persistent margin entire or sub- 



crenate. Spores ellipsoid, -^ mic. Parmelia, Fr. L. E. p. 



141. Lecanora, Koerb. Syst. p. 139. L. argopholis, & L. frus- 

 tulosa, Ach., Nyl. Scand.p. 166. 



Kocks. Greenland (Valil), Th. Fries I. c. 1861. White 

 Mountains, alpine, Tuckerman. Vermont, Frost. Colorado, 

 JBrandegee in herb. Sprague. California, Bolander, 



12. L. Cenisia, Ach. ; thallus tartareous, made up of coarse, 



