200 LECANORA. 



Granitic rocks. Notch of the White Mountains, Tuckerman 

 Gen. 1872. 



39. L. epulotica (Ach.) Leight. ; thallus tartareous, rimulose, 

 pale ; apothecia immersed, concave, colourless, or pale-roseate ; 

 the thick, irregular margin angled or contracted. Spores as 

 in&. 



b. subepulotica, Nyl. ; thallus thickened, coarsely verrucose- 

 areolate; apothecia small, soon superficial and plano-convex; 

 pale flesh-coloured and reddish. Spores ovoid- ellipsoid, ^ mic. 

 Nyl. in litt. olim. 



a, on limestone ; not observed here. &, on granitic rocks. 



Vermont, Russell. Massachusetts, Tuckerman. Canada, Drum- 



mond. This and the last-preceding species are closely akin. 



What is here referred to L. odora does not differ from Schaer. 

 Lick. Helv. n. 36, but has only been found once. L. subepulotica 

 was determined by Nylander in the Vermont specimen ; but the 

 others now closely approach Zw. exs. n. 114, referred by Koerber 

 to a state of L. odora ; our American specimens differing how- 

 ever from the last species in smaller spores. 



40. L. Bockii (Fr.) Th. Fr.; thallus tartareous, areolate- 

 verrucose ; from pale becoming tawny- and blackish-brown ; on 

 a black hypothallus ; the discrete areoles now flat and angulate, 

 and now gibbous and wart-like, commonly scattered ; apothecia 

 small, sessile; disk (now continuing punctiform) black, now 

 papillate or at length plicate ; the thick, entire thalline margin 



persistent. Spores ovoid- ellipsoid, ^ mic. Th. Fr. Scand. 



p. 269. Parmelia, Fr. L. E. p. 150. L. sophodopsis, Nyl. in 

 Flora, 1876,1). 233; 1878, jp. 204. 



Granitic rocks, New England, Tuckerman, Frost, etc. A 



not uncommon but difficult lichen, which is easily overlooked or 

 misunderstood. 



* * * * * Acarospora. Thallus locate or squamulose pass- 

 ing into areolate ; or deficient. Apothecia innate for the most 

 part and concave. Spores very minute and numerous. 



41. L. molybdina (Wahl.) Ach. ; thallus tartareous, adnate, 

 stellate-radious, the lobes linear, breaking up more or less into 

 verrucose areoles ; from light- becoming dark-umber-brown, and 

 black ; apothecia small to very small, innate, becoming a little 

 prominent ; disk urceolate, brownish-black ; with a proper mar- 



