260 PROCEEDINGS OF THE AMERICAN ACADEMY 



336. Schcer. Spicil p. 140; Borr. in Hook. Br. Fl. 2, p. 180. L. 

 corticola, Ach. Syn. 



Trunks on the coast of New England. New York, Halsey. Penn- 

 sylvania, Muhl. 



20. L. dolosa, Wahl. Cr. somewhat verrucose, greenish-glaucous, 

 oftener leprous and white ; apoth. (minute) depressed; exciple cupular, 

 with a very thin margin ; disk very black, nearly naked, often punc- 

 tate-scabrous, cinereous-blackish within. Fr. Lichenogr. p. 337. L. 

 pinicola, Sommerf. Siippl. Fl. Lapp. p. 153, L. pinicola, Borr. in 

 Hook. Br. Fl. 2, p. 176 ? Tuckerm. Lich. N. E. L c. 



Scaly bark of old pines ; New England. 



21. L. melancheiina, Tuckerm. Cr. cartilagineous, areolate-verru- 

 cose, becoming somewhat lobulate, glaucous-white, confused with the 

 hypothallus ; apoth. appressed, somewhat plane, disk equalling the very 

 thin margin, at length convex, scarcely excluding the margin, very 

 black, polished, ajid shining. 



Trunks ; and very common on rails on the coast of Massachusetts 

 (Ipswich, Mr. Oakes, Lynn, Hingham, &c.), and occurring on dead 

 wood at the White Mountains. Disk sometimes a little pallescent, but 

 the margin always very black. 



22. L. sabuletorum, Fr. Cr. cartilagineous, at first contiguous, be- 

 coming rlmose-areolate, granulate and somewhat lobulate, cinerascent 

 or fuscous, confused with the hypothallus ; apoth. produced from the 

 crust, horny ; exciple annular, with an evanescent margin ; disk naked, 

 often fuscescent. Fr. Lichenogr. p. 339. Lichen s. Lecidea muscorum, 

 Auct. quorund. 



On the earth, decaying wood and mosses, stones, and trees, ascend- 

 ing to alpine districts ; New England. New York, Torrey. Pennsyl- 

 vania, Muhl. Arctic America, Rich. 



23. L. arctica, Sommerf. Granules of the crust cartilagineous, at 

 first discrete, papillseform, persistent, fuscescent-cinereous ; apoth. im- 

 mixed, somewhat immarginate, cajsious-pruinose, horny and cinerascent 

 within. Fr. Lichenogr. p. 342. Sommerf. Suppl. Fl. Lapp. p. 156. 



Upon mosses in alpine districts ; White Mountains. 



24. L. milliaria, Fr. Granules of the crust at first discrete, fuscous, 

 and cinereous-white, often deliquescent and leprous ; apoth. produced 

 among the granules, globose, somewhat immarginate, naked ; exciple 



