206 KDsTODIN'A. 



cent, or now reduced and glebous at the centre, but expanding, 

 imbricate, lobate and crenate at the circumference ; pale-yellow- 

 ish becoming tawny, often gray-pruinose ; apothecia smallish to 

 almost middling, innate; disk flattish, brownish-black, sub- 

 marginate ; thalline margin tumid, entire. Spores -^ mic. 

 Parmelia, Fr. L. E.p. 129. Lecanora, Nyl. Scand. p. 148. 



Naked earth in alpine districts. Greenland (Vahl), Th. 

 Fries I. c. 1861. Rocky Mountains in Colorado, Brandegee in 

 herb. Sprague. 



4. M. oreina (Ach.) Mass. ; thallus adnate, tartareous-cartil- 

 agineous; verrucose- areolate ; from greenish - straw - coloured 

 becoming yellowish; areoles now crenate, passing into a ra- 

 diously lobed circumference, which is more or less black-edged ; 

 apothecia smallish, lecanorine, innate, at length superficial and 

 sub-sessile ; the disk becoming turgid, and black ; the thalline 

 margin obtuse and very entire, or now disappearing, and the 

 apothecia lecideoid. Spores short-ellipsoid, obtuse, -|y mic. 

 Lecanora, Schcer. Enum. p. 67. Nyl. Scand. p. 147. Parmelia, 

 Fr.L. E.p. 113. 



Rocks. New England and Canada, Tuckerman Enum. 1845. 

 Tennessee, Eavenel. Kansas, Hall. Rocky Mountains, Hayden. 

 California, Bolander. Peripheral lobes now obsolete. 



5. E. chrysomelcena (Ach.) Tuckerm. ; thallus sub-membra- 

 naceous, areolate-squamulose ; scales commonly discrete, flat, 

 rounded, more or less lobed ; pale- to bright-yellow ; apothecia 

 almost middling-sized, lecanorine, appressed, flat ; disk dark- 

 red, and blackening ; the persistent, stout, entire thalline mar- 

 gin at length wrinkled and flexuous. Spores J^ mic. Syn. 



p. 148. Tuck. Syn. N. E. p. 37. 



Rocks. Pennsylvania, Mulilenberg Catal. 1818. North Car- 

 olina, Schweinitz. Georgia, Eavenel. Massachusetts, Willey. 

 Apothecia l mm - to I"" 1 -, 5 wide. 



* * Eurinodina. Thallus uniform. Hypothecium colour- 

 less; except in n. 13, and 14. Spores Ulocular ; except in n. 15. 



6. E. Ascociscana, Tuckerm.; thallus of membranaceous, 

 adnate, rounded, concentrically wrinkled, scale-like areoles, 

 which run together more or less, forming a chinky crust ; from 

 greenish- becoming pale-cinnamon-brown ; apothecia smallish 

 to middling -sized, sessile; disk plano-convex, scabrous and 



