LECANORA. 187 



glebous granules, which are scattered, or pass finally into a ver- 

 rucose - areolate crust; glaucous - whitish or cinerascent; apo- 

 thecia smallish to middling, sessile, more or less evidently zeo- 

 rine ; disk finally convex, dirty-yellow, livid, and blackening, 

 with a thin ashy bloom ; the thalline margin now persistent and 

 soon crenate, or depressed and disappearing, leaving only the 



sub - marginate disk. Spores ellipsoid, ^^ mic. Syn. 163. 



Parmelia, Fr. L. E. p. 180. Zeora, Koerb' Syst. 137. 



Eocks ; and on the earth. On schist, Wantastiquet Moun- 

 tain, Vermont (Frost), Tuckerman Gen. 1871. Metamorphic 

 sandstone, on the coast of California ; and on the earth in the 



Tosemite, Bolander. So close to L. subfusca, v. atrynea, 



Ach., that some do not separate the two; but the present is a 

 marked lichen, and is admirably represented in the cited speci- 

 mens. 



13. L. sordicla (Pers.) Th. Fr. ; thallus tartareous, contigu- 

 ous, rimose-areolate, now somewhat effigurate ; glaucous- and 

 brownish-white ; apothecia smallish to middling, innate becom- 

 ing superficial, and from flattish soon convex or even globular, 

 .more or less zeorine ; the disk from pale becoming livid, and 

 black, pruinose; the depressed, entire thalline margin disap- 

 pearing at length, and the apothecia quite lecideoid. Spores 



ellipsoid, -^ mic. Parmelia, Fr. L. E. p. 178, max. p. excl. p. 



Lecanora, Th. Fr. Scand. p. 246. L. glaucoma, Ach., Nyl. Scand. 

 p. 159. 



Kocks. Arctic America (Richardson), Hooker I. c. 1823. New 

 York, Halsey. New England, Tuckerman. Colorado, Brandegee 



in herb. Sprague. California, Bolander. The lichen is now at 



length readily mistaken for a Lecidea. 



14. L. subfusca (L.) Ach. ; thallus cartilagineous, contigu- 

 ous, soon chinky, and becoming granulate-verrucose ; glau- 

 cescent, dirty-white, or cinerascent; apothecia plano-convex; 

 disk reddish-brown, and blackening, naked; the persistent, 

 erect thalline margin entire, or now flexuous, or crenate. 



Spores ellipsoid, ~ mic. Syn. p. 157, pr. p. Parmelia, 



ScJicer. Spicil. p. 389, pr. p. ; Enum. 73, max. p. Lecanora, 

 Nyl. Scand. p. 159, pr. p. SUzerib. in Bot.^Zeit. 1868, n. 52, pr.p. 



a. allophana, Ach. ; thallus soon granulate-verrucose ; apo- 

 thecia at length middling-sized ; dark-brown ; the at first entire 

 margin becoming flexuous and crenate. Spores of the full size 



