68 PHYSCIA. 



sessile; the disk naked; the margin crenulate. Spores bilocular, 



^^ mic. Nyl. Syn. 1, p. 416, a. Parmelia speciosa, Ach. L. 



U. p. 480. Fr. L. E. p. 80, a. Tuck. exs. n. 81. 



Trees and mossy rocks in woods. Pennsylvania (Muhlen- 

 berg), Hoffmann D. Fl. 1796. Common from New England 

 southward, in the mountains at least, to Alabama, Beaumont ; 

 and westward to Wisconsin, Lapham. 



2(b). P. hypoleuca (Muhl.) Tuckerm. ; thallus ample, cartila- 

 gineous, rather loosely stellate, appressed, smooth and naked 

 above, greenish-glaucescent ; beneath largely ecorticate and 

 very white (or now somewhat blackening, or now yellowish), and 

 densely beset with hispid, black fibrils ; lobes multifid, flat, the 

 edges now ascendant, and now also powdery ; apothecia mid- 

 dling-sized to large, sub-pedicellate (becoming crowded), the 

 naked, blackening disk enclosed by a crenate-foliolate margin. 



Spores ^H mic. Parmelia, Muhl. Catal. Tuckerm. Syn. N. E. 



p. 33. Lich. Amer. n. 108. P. speciosa, v. hypoleuca, Ach. Syn. 

 p. 211. Physcia, Nyl. Syn. 1, p. 417. 



Trunks, Pennsylvania (Muhlenberg), Ach. Syn. 1814, and 

 throughout the Atlantic and Gulf States ; as west to Illinois, 

 Hall; New Mexico, Mex. Bound. Survey; and Mexico. It is 

 - widely diffused through the warmer regions of the earth. 



2(c). P. Wrightii, Tuckerm. herb. ; thallus ample, cartila- 

 gineous, appressed, smooth, but densely beset at the centre with 

 wart-like lobules, naked, brownish-glaucescent ; beneath corti- 

 cate, brown, with scattered, simple, pale fibrils; the sparingly 

 divided lobes compaginate ; apothecia ample, sub-sessile ; disk 

 blackish-brown ; margin crenate. Spores ^j mic. 



Rocks, Valley of the Rio Grande, Texas (Mexican Boundary 

 Survey), Wright. 



2(d). P. Ravenelii, Tuckerm. herb. ; thallus membranace- 

 ous-cartilagineous, stellate, appressed, smooth above; beneath 

 corticate, brown, and blackening, with fibrils of the same colour ; 

 lobes closely imbricated, shorter, wider, and less deeply cleft 

 than in P. speciosa, with minutely notched, powdery margins ; 

 apothecia of middling size, the crenate margin soon powdery. 



Spores smaller than in P. speciosa, ^ mic. P. speciosa, v. 



granulifera, Tuckerm. Obs. Lich. 1, 1. c. p. 391, in part. 



Trunks; low country of South Carolina (H. W. Eavenel, Esq.,) 

 Tuckerman I. c. 1860. Louisiana, Hale. Texas, Wright; Hall 





