PELTIGERA. 105 



Oregon, Hall. British Columbia, Macoun. &, New England, 



Tuckerman, Lich. N. E. 1841. Canada, Macoun. 



5(6). N. Lusitanicum, Schssr. ; thallus coriaceous-rnembra- 

 naceous, sinuately at length deeply cut, with crenate tips, from 

 smooth becoming more or less wrinkled above ; and from brown- 

 ish-glaucescent dark-reddish-brown; beneath smooth; yellow 



within ; apothecia of middling size. Spores as in the last. 



Schcer. Enum. p. 323. 



Rocks, trees, and bushes. California, Bolander. Oregon, 



Hall. Nephromium sub-laevigatum, Nyl. Syn. 1, p. 321, from 



the peak of Orizaba, Mexico, is, to judge by the diagnosis, dis- 

 tinguished especially from N. Icevigatum by its more or less 



reticulately wrinkled thallus. N. cellulosum, Ach., is another 



member of the stock of N. Icevigatum, the whole difference of 

 which (a difference sufficiently foreshadowed in the older spe- 

 cies) is indicated by its name ; and it is observable that Nylander 

 inclines, I. c. to recognize this Australian lichen (Van Diemen's 

 Land, Herb. Hook.) in Europe. 



XVI. PELTIGERA (Willd., Hoffm.) Fee. 



Apothecia peltseform ; with a sub-crenate margin ; ad- 

 nate to the upper side of extended lobules, or rarely mar- 

 ginal. Spores fusiform, or acicular, 4-plurilocular, at length 

 colourless. Thallus froudose, veiny and villous beneath, 

 where it is deprived of the cortical layer. Gonimous layer 

 constituted now (n. 1, 2) of gouidia; but, in all the other 

 species, of gonimia. A familiar, small group of the north- 

 ern hemisphere, which extends however into the cooler 

 regions of the southern ; and becomes even, in some forms, 

 tropical. We have all the species. 



* Gonimous layer constituted of gonidia. 



1. P. venosa (L.) Hoffm. ; thallus small, coriaceous, becom- 

 ing fan-shaped, simple ; greeuish-ash-coloured ; beneath white, 

 variegated with coarse, divaricate, blackening veins ; apothecia 

 marginal, middling-sized, rounded, horizontal; disk from red- 

 dish finally blackish-brown. Spores fusiform, brownish, as in 



ihe other species, while in the thekes, 4-locular, ^ mic. Fr. 



L. E. p. 48. Tuckerm. Lich. exs. n. 63. 



