LECA^ORA. 189 



Koerb. Syst. p. 143. Th. Fr. Scand. p. 250. L. umbrina, Mass. 

 Nyl. 



b. Sambuci (Pers.) ; thekes 12-16-sporous. Lecanora Sam- 

 bud, Nyl. Th. Fr. 



a, Rocks, dead wood and trees. Greenland ( VaM), Th. Fries 

 I c. 1861. Canada, Drummond. Northern and middle States, 

 Michener; Tucker man^ etc. Ohio, Lea. Illinois, Hall. Vir- 

 ginia, Curtis. Kansas and Missouri, Hall. Alabama and Ar- 

 kansas, Peters. Rocky Mountains, Hayclen. California, Bolander. 



Oregon, Hall. b, trees, Weymouth and New Bedford, Willey. 



1 am unable at present to discriminate here a L. albescens, 



Th. Fr., var. /5 of which, as exhibited in Hepp. n. 65 has been 

 referred by Nylander to the present species, as later to the one 

 first-mentioned, under the name of L. galactina, Nyl. ; though 

 it may occur with us. The two plants are very similar. 



16. L. granifera, Ach. ; thallus papillate-granulate, becom- 

 ing at length warty-rugged ; glaucescent and cinerascent ; more 

 or less lemon-coloured within ; upon a blackening hypothallus ; 

 apothecia smallish, sessile, flattish ; the disk (pale, livid) red- 

 dish-brown and blackening, now sub-marginate, the stout, very 

 entire thalline margin at length crenulate. Spores ellipsoid, 



^H mic. Syn. p. 163. L. granifera & L. mesoxantha, Nyl. N. 



Gran. p. 33; Syn. N. Caled. p. 28. L. sorediifera, Fee Ess. p. 

 114, t. 28, /. 3. 



Trees in the warmer regions of the earth. Florida, at 

 Gainsville, Eavenel ; at Cotoosa river, Austin. 



17. L. atra (Huds.) Ach. ; thallus cartilagineous, soon gran- 

 ulate, and rugged- warty ; or the warts passing into areoles ; 

 glaucescent, or whitish -ash -coloured; apothecia smallish to 

 middling, innate becoming sessile, flattish ; the very black pol- 

 ished disk at length tumid j black within ; the persistent thal- 

 line margin for the most part very entire; now blackening. 



Spores ellipsoid, ^^ mic. AcJi. Syn. p. 146, a. Nyl. Scand. 



p. 170. Parmelia, Fr. L. E. p. 142, a. 



Rocks and trunks. Northern and middle States, Muhlenberg 

 Catal. 1818. Arctic America, Richardson. Carolina and Flor- 

 ida, Eavenel. Alabama, etc., Peters. Louisiana, Hale. Texas, 

 Wright. California, Wright. Spermatia scarcely bowed. 



18. L. atriseda, Nyl. ; thallus of scattered or contiguous, more 



