72 ACOTYLEDONS. LICHENS. CoUcma. 



green, apothecia central crowded at length convex reddish 

 brown their margin entire, ^ch. Syn. Lick. p. 321. Liclieii 

 nigrescens, E. B. t. 345. L. FespertUio, Lightf. p. S40. 

 Hab. Trunks of trees, not uncommon. 



7. C Jiacddum, thallus foliaceous membranaceous smooth black- 

 ish green, lobes distinct rounded entire lax waved, apothecia 

 scattered nearly plane reddish, their margin thin entire. Ack. 

 Syn. Lick. p. 32'2. Lichen Jiaccidus, E. B. t. 1653. 



Hab. Received from Scotland by Mr. Dickson. Sm. in E. B. 



8. C. furvum, thallus foliaceous membranaceous somewhat 

 wrinkled complicate blackish green granulated on both sides, 

 lobes rounded unequal waved and crisped entire, apothecia 

 scattered plane dark brown their margin entire. Ack. Syn. 

 Lick. p. 323. Lichen grannlatus, E. B. t. 1737. 



Hab. Trunks of trees, rocks, &c. ; mentioned by Lighff. as a var. of 

 C. nigrescois. 



**** Thallus foliaceous', lobes rounded , meynhranaceous, thin, naked, 

 glaucous grey, subdiaphanous. Apothecia subpedicellate. (Leptogium.) 



9. C. tremelloides , thallus foliaceous membranaceous thin sub- 

 diaphanous lead-colour obsoletely rugose and dotted, lobes 

 rounded somewhat cut, apothecia scattered subpedicellate 

 plane reddish brown their margin pale. Ack. Syn. Lick. 

 p. 326. Lichen tremelL, E. B. t. 1981. L. cochlcatus, Dicks. 

 Crypt, fuse. 1. t. 2./. 9. 



Hab. East side of the rock of Dumbarton Castle, Sir J. E. Smith. 

 Upon rocks among moss, at Aros, Isle of Mull, plentiful, Mr. 

 Turner and Hook. 



10. C. lacernm, thallus nearly erect foliaceous membranaceous 

 subdiaphanous subrugose with obscure reticulations glaucous, 

 lobes small sul)imbricate'd cut and laciniated and somewhat 

 fringed, apothecia scattered rather concave red their margin 

 pale. Ach. Syn. Lick. p. 327. Lichen lacer, E. B, t. 1982. 

 L. tremelloides, Ligktf. p. 842. 



Hab, Common on the ground among mosses, Lightf. 



***** Thallus very slender, laciniated and branched. (Polydiidium). 



1 1. C. suhlile, thallus substellate the segments very narrow linear 

 appressed very much branched obtuse, apothecia central nearly 

 plane of the same colour as the crust their margin thin entire, 

 Ach. Syn. Lich.p. 328. Lichen snblilis, E. B. t. 1008. 



Hab. Scotland, not unfrequent, Mr. Brown. 



12. C. mnscicola, thallus pulvinate brown, branches rounded 

 nearly erect flexuose uneven subfastigiate rather obtuse, apo- 

 thecia nearly terminal plane brown margined. Ach. Syn. 

 Lick. p. 328. Licken muscicola, E. B. t. 2264. 



Hab. Rocks among mosses in the Highland!*, Dickson. 



