LECANORA. 201 



gin more or less distinct from the tumid thalline one. Spores 



oblong, very numerous and minute. Nyl. Scand. p. 173. 



Parmelia, Fr. L. E. p. 126. 



a. vulgaris, Schser. ; thallus thick ; the proper margin of the 



apothecium mostly undistinguishable. Lichen molybdinus, 



WaJil. Lapp. p. 418, t. 29, f. 1. Lecanora, Ach. L. U. p. 430. 



6. ereutica, Wahl. ; rather less thick and coarse ; the proper 

 margin distinct. Wahl. I c. Fr. I. c. 



c. microcyclos, Wahl. ; smaller, the thallus thinner and flat- 

 ter; the apothecia impressed. Wahl. 1. c. Fr. I. c. 



a, Maritime rocks. Greenland, Fries I. c. 1831. Elsewhere 



in Arctic America, Kane. &, Tadousac, Canada, Drummond. 



c, Mt. Desert, Maine, Tuckerman. 



42. L. chlorophana (Wahl.) Ach. ; thallus tartareous, adnate, 

 areolate-verrucose, smooth, lobed and radious at the circumfer- 

 ence; bright-lemon-coloured; apothecia small to almost mid- 

 dling, becoming superficial >nd sessile ; the pale, naked disk at 

 length brownish- or gamboge-yellow, and turgid, excluding the 

 entire, now flexuous thalline margin. Spores at length oblong ; 



very numerous and minute. -L. U. p. 436. Lichen, Wahl. 



Lapp. p. 416, t. 28, /. 2. Parmelia, Fr. L. J&. p. 117. 



Alpine rocks, as also on those of lower elevation, westward. 

 Greenland ( Vahl), Th. Fries I. c. 1861. Organ Mountains, Texas, 

 Wright. Rocky Mountains, Colorado, Lapham. ' Islands of 

 Great Salt Lake, Utah, Watson. Alpine County, and Monte 

 Diablo, California, Lapham ; Bolander. Dalles of the Columbia, 

 Hall. None of our plants appear to be referable to the var. 

 oxytona of the south of Europe, which is indeed (at least in 

 Schaer. Helv. n. 335) ill enough distinguishable ; though generally 

 admitted by authors. 



43. L. xanthophana, Nyl.; thallus squamulose; scales pel- 

 tate, round-lobulate, soon reduced to angulate areoles, either 

 flat or turgescent, scattered or crowded; lemon-yellow; apo- 

 thecia small to almost middling, innate ; disk impressed or flat, 

 dark-red (and blackening) with an entire, more or less evident, 



thalline margin. Spores very numerous and minute. Nyl. 



Lich. And. Boliv. in Ann. Sci. 4, 15, p. 379. L. bella, Nyl. Chil. 

 in Ann A, 3, p. 156. L. chrysops, Tuckerm. Suppl. I, I. c. p. 425. 



