PAKMELIA. 55 



Mexico, C. Mohr. Agreeing so well with the description of 

 the Brazilian lichen in everything but the colour of the under 

 side (which exactly resembles and suggests that of P. perforate 

 * hypotropa] that I cannot but consider it the same. Its place 

 appears however to be much less with P. perlata than with P. 

 perforata. 



2(d). P. crinita, Ach.; thallus dilated, of the colour of the 

 last, coriaceous-membranaceous, beset densely with minute 

 granules and branchlets (isidiophorous) beneath black and black- 

 flbrillose; the rounded lobes ciliate; apothecia ample, cyathi- 

 form, commonly imperforate. Spores of the Northern lichen 



ellipsoid, 2 mic. ; of the Southern, ^| mic. Syn. p. 196, 



Tuckerm. Syn. N. E. p. 25. P. perforata, var., Fr. L. E. p. 58. 



Trees, and also rocks. New England and the northern 

 States, Muhlenberg in Ach. Syn. 1814. South Carolina, Eavenel. 



Texas, Wright. The southern plant (Wright Lich. Cub. n. 69) 



is perhaps more readily comparable with P. perlata than the 

 northern lichen, but is differenced as well by the distinct flbrillose 

 character of the under side, and the ciliate margin, as by the 



isidiophorous upper side. P. proboscidea, Tayl. ! (P. perlata, 



v. ciliata, Koerb. ! as of Nylauder Syn.} was referred (e char.} 

 to P. perforata by Fries ; and, I can entertain no doubt, correctly. 

 It is sometimes well comparable with the present. 



2(e). P. sulphur ata, Nees & Flot. } like the southern P. 

 crinita, as respects both upper and under sides, but from glau- 

 cescent passing soon into greenish-yellow above ; 



* white within ; the apothecia not observed. P. chrysantha 



Tuck. herb. 



* * sulphur-coloured within ; apothecia commonly imperforate. 



Spores ellipsoid, ^^ mic. P. sulphurata, Nees & Flot. Linncea, 



1834, p. 501. Tuckerm. in Wright Lich. Cub. n. 72. Nyl. Syn. 

 l,p. 377. 



Trunks; *, Blue Ridge in Virginia, Tucker man. Mountains 



of Tennessee, Prof. Shepard. Louisiana, Hale. * * South 



Carolina, Dr. Mellichamp. Louisiana, Hale. Texas, Hall. 



The specimens leave it scarcely doubtful that * is undistinguish- 

 able in species from * * ; as it is also exceedingly near to P. 

 crinita. 





