100 STICTA. 



bia, Lyall. Mexico (fertile), Krempelhuber Lich. exot. It is 



observable that while the present is a cosmopolitan lichen, so 

 marked that it seems impossible not to give it a separate place, 

 the near akin 8. sylvatica is all but confined to Europe, and 

 closely approaches the northern (and original) form of S. querci- 



zans. It is difficult to understand how such an observer as 



Dillenius should emphasize as he does the difference between 

 the fruit of his t. 27, f. 101 (S. sylvatica} and that of his t. 26, 

 f. 100 (S. fuliginosa), but much more difficult to suppose with 

 Delise (Stict. p. 87) that the figure 101, etched as well as drawn 

 by the author of the Historia Muscorum, should represent what 

 was nothing less than a confusion of plants of different genera. 

 But we cannot but note that the figure 100, exhibiting a lichen 

 from.Cader Idris in Wales, contrasts also with 101, irrespectively 

 of the peltate difference of the last, in having the apothecia not 

 even marginal, but scattered; a character which reappears in 

 most books, though certainly qualified in Ach. L. U. And it is 

 not then without interest that Mr. Borrer's already cited plant, 

 which was also from Cader Idris, and determined by him as S. 

 fuliginosa, has on its lobes forty odd apothecia, and that these 

 are all but uniformly close to the margin. These small fruits 

 (averaging 1-1, f> mm -) have furnished me with abundant spores; 

 upon which compare Nyl. I. c. 



13(c). S. limbata (Sm.) Ach. ; thallus much as in the last but 

 smallish, membranaceous, orbiculate, and sub-rnonophyllous ; 

 from leaden- at length liver-brown, smooth ; the broad, rounded 

 lobes beset toward the margins with conspicuous, rounded, grey 

 soredia; [apothecia scattered, appressed; disk rusty-brown, finally 



excluding the margin.] Fr. L. E. p. 52. Nyl. Syn. p. 346. 



Mudd Man. Brit. Lich. p. 88. 



Oak trees, on the Coast range of mountains, Oregon, Herb., 

 J. W. Eckfeldt. 



14. S. crocata (L.) Ach. ; thallus membranaceous-coriaceous, 

 irregularly laciniate, pitted more or less and- at length reticu- 

 lately ribbed, besprinkled commonly and edged with lemon-col- 

 oured soredia ; from greenish-glaucescent becoming brownish, 

 tawny, or russet-brown ; beneath of much the same colour or 

 blackening, the spongy nap speckled with lemon-coloured, sore- 

 diiform cyphels ; lobes wide and rounded, with erose or crenate 

 circumference, or (f. laciniosa] narrowed into sub-linear, pinna- 



