

PARMBLIA. 57 



tangled; apothecia middling-sized, elevated; disk chestnut, 



with a somewhat entire margin.. Spores ellipsoid, ^ mic. 



Eschw. Bras. p. 202. Mont. & V. d. Bosch. Jav. p. 20. Nyl. 

 Syn. I, p. 387. P. Americana, Mont. Chil. 



Trees. Orizaba, Mexico (Galeotti), Nylander Syn. 1860. Well 

 comparable with Evernia furfuracea. The South American 

 lichen proves to be uudistinguishable from the Asiatic ; though 

 the spores are perhaps a little smaller. 



5. P. tiliacea (Boffin.) Floerk. ; thallus closely adnate to the 

 substrate, soon and much narrowed ; coriaceous-membrauaceous, 

 smoothish, glaucescent ; beneath black, and densely black- 

 fibrillose ; the contiguous, sinuate-laciniate, more or less wrinkled 

 lobes rounded, and crenate, or more deeply divided; apothecia 

 (frequent) middling-sized ; disk chestnut, with a crenulate mar- 

 gin. Spores rounded-ellipsoid, small, -|^ mic. Floerk. in 



Sommerf. Lapp. p. 113. Fr. L. E.p.59. Tuck. Lich. exs. n. 

 70. Nyl. Sijn. p. 382. 



b. sublcevigata, Nyl. ; lobes sub-linear, more or less pinnately 

 many-cleft and discrete, often stellate ; apothecia and spores as 



in a. Nyl. 1. c. P. tiliacea, v. minor, Mull. Flora. 1877, n. 5, 



e descr. 



c. relicina ; thallus pale-yellowish j apothecia and spores as 

 in a. P. relicina, Fr. 8- 0. V. p. 283, teste Mont. M. & V. d. 

 Bosch Lich. Jav. p. 19. Nyl. Syn. l,p. 386. P. tiliacea, v. 

 flavicans, Tuckerm. in Wright Lich. Cub. n. 74. 



d. sulphurosa ; medullary layer sulphur-yellow ; apothecia, 

 and spores as in a. 



Trees, and stones, very common. Canada, and northern and 

 western States; Muhlenberg Catal 1818, etc. Also throughout 



the southern States j M . A. Curtis, Hale, etc. b, southern 



States ; Ravenel, Hale, Wright ; but similar forms occurring 



also northward. c, a lichen of Cuba, to be expected in the 



extreme south. d, Illinois, Hall. 



The North American P. tiliacea is a smaller plant than the 

 European ; but our first form appears to be otherwise uudis- 

 tinguishable. And much the same remark may be made of the 

 common, narrow-lobed American forms, which scarcely differ 

 from such European ones as the var. carporhizans, Nyl. (Herb. 

 Church. Babingt. Anz. Ital. n. 102) but in inferior dimensions* 



