



SOLORLSTA. Ill 



Trees, Mexico (var. Mexicanum), Njl.Enum. E. Wrightii, 



Tuckerm., is a native of the island of Cuba ; and the few other 

 species are cited from South America. 



XVIII. SOLORINA, Ach. 



Apothecia rounded ; innate in the upper side of the thal- 

 lus ; the margin obsolete. Spores from ellipsoid becoming 

 fusiform-oblong, bilocular, brown. Thallus frondose; be- 

 neath villous, and veiny 5 the cortical layer mostly wanting 

 on this side. Gouimous system constituted of gonidia (in 



the gonimous layer) and gonimia. This little cluster is 



represented in the alpine and arctic regions of the earth by 

 one marked species, and in the temperate ones of Europe 

 and America by another j to which last the other described 

 forms are very closely akin. 



1. 8. crocea (L.) Ach. ; thallus smallish, coriaceous; reddish- 

 brown ; beneath orange-saffron, with darker, coarse, branching 

 veins; apothecia middling to ample, appressed, at length some- 

 what tumid; disk red-brown. Spores in eights, ^J mic. 



Ach. L. U. p. 149. Nyl. Syn. 1, p. 329. 



On the earth in alpine districts. Greenland, Dillenius, Hist. 

 Muse. 1741. N. of Point Lake, Richardson. Labrador, Wenck. 

 Rocky Mountains, Hall. Oregon, Dr. Lyall. Shores of Behr- 

 ing's Straits, Wright. 



2. S. saccata (L.) Ach. ; thallus membranaceous, sub-imbri- 

 cate ; greenish-ash-coloured ; beneath white, cottony, fibrillose ; 

 apothecia middling-sized, appressed, soon sunken in pits ; disk 



dark-brown. Spores mostly in fours, ^| mic. Ach. L. U. p. 



149. Tuck. Exs. n. 64. Peltigera, Fr. L. E. p. 49. 



b. spongiosa, Nyl. ; thallus reduced to little more than an 



edge of the sunken apothecium. Nyl. Syn. 1. c. S. limbata, 



Mudd Man. p. 85. 



On the earth, especially in calcareous regions. Newfound- 

 land, De la Pylaie, 1826. Bear Lake, Herb. Hook. Greenland, 

 Vahl I. c. Shores of Behring's Straits, Wright. New York, 



Tuckerman. Vermont, Russell. b, spongiosa, on the same 



substrates, Greenland, Vahl; as elsewhere in Arctic America, 



