LECA^ORA. 199 



Rocks, a, Arctic America (Ricliardson), Hooker I c. 1823. 

 Canada, Drummond. New York (as throughout New England, 

 and northern and middle States), Halsey. Alabama, Peters. 

 California, Bolander. &, rocks in moist places, White Moun- 

 tains, Tuckewian. Alabama, Peters. c, Canada, Drummond. 



New England, where also on rails, Tuckerman. California, very 

 fine, Mann ; Bolander. 



37(&). L. calcarea (L.) Sommerf. ; thallus tartareous, areo- 

 late-verrucose ; glaucescent, or white, now mealy ; apothecia as 

 in the last preceding, but a thin proper margin becoming at 

 length distinguishable ; and the disk commonly gray-pruinose. 

 Spores as in the preceding, b. Nyl. Scand. p. 154. 



o. contorta, Fr. ; areoles discrete, irregular, depressed at the 



circumference; pale-greenish-lead-coloured, L. calcarea, f. 



Hoffmanni, Nyl. I. c. 



Calcareous rocks. New York (as throughout the northern 

 and middle States), Halsey, 1823. Kansas, Hall. Utah, Lap- 

 ham. Rocky Mountains, Hayden. 6, Greenland (Vahl), Th. 



Fries I c. 1861. Kansas, Hall, Texas, Wright. Alabama, 

 Peters. 



37 (c). L. cinereo-rufescens, Nyl. ; thallus tartareous, smooth, 

 rimose-areolate, the areoles commonly discrete; upon a black 

 hypothallus ; apothecia of the size of those of L. cinerea, but 

 the flattish naked disk rusty-red. Spores ovoid, smaller than in 

 any other member of the group, -^ mic. Nyl. 1. c. p. 154. 



Rocks, alpine summit of Mt. Hood, Oregon, Hall. The 



lichen of Hepp. n. 625 ; but doubtless the L. alpina of Th. Fr. 

 Scand. p. 283, as well by the locality, as the reaction with potash. 



37(d). L. lacustrls (With.) Nyl.; thallus thin, smooth, rimu- 

 lose; pale-brick-coloured; apothecia small, immersed, and more 

 commonly urceolate; reddish or brownish. Spores ellipsoid, 

 * mic. Nyl. I. c. p. 155. 



Rocks often inundated. Greenland (Vahl), Th. Fries I. c. 

 1861. New England, Tuckerman. Alabama, Peters. 



38. L. odor a (Ach.); thallus tartareous but thin, rimulose- 

 areolate ; pale-ash-coloured ; apothecia small to very small, im- 

 mersed, concave; disk yellowish-flesh-coloured; the thin, de- 

 pressed, smooth margin paler. Spores ovoid- ellipsoid, ^J mic. 

 Gryalecta, Schcer. Spicil. p. 80. Fr. L. E. p. 197. 





