36 CETRAK1A. 



erring below ; the jagged edges of the lobes often sorediate, and 

 prolonged finally more or less into conspicuous, coralloid branch- 

 lets ; apothecia (rare) sub-terminal, ample ; disk dark-chestnut ; 

 margin irregular and disappearing. Spores rounded-ellipsoid, 



t|il mic. Spermatia as in the last. Ach. L. U. p. 509. Fr. 



L. E. p. 38. Platysma, Nyl. Syn. I, p. 313. 



b. stenopliylla ; lobes loose, narrow-linear, channelled ; black, 

 or now whitening beneath. 



Trees, and rocks, in mountain forests, New England, Tucker- 

 man Enum. 1845. Newfoundland (strongly lacunose; a state 

 occurring also in Scotland, Borrer ! but not well referable to C. 

 lacunosa), Despreaux. Oregon, and Washington Territories, 



and Vancouver's Island; Dr. Lyall, etc. &, Oregon, Wilkes 



exped. California, Bolander. The variety is analogous to C. 



lacunosa, &, but has the characters of the present species ; and 

 is explained by European states, especially of the v.fallax, Ach. 

 The colour of the thallus of C. glauca, a, finally darkens; 

 becoming now olivaceous-brown, v.fusca (Flot.), on rocks, in the 

 White Mountains. 



19. C. chrysantha, Tuckerm. ; thallus cartilagineous-coriace- 

 ous, foliaceous, round-lobed, rugulose j straw-coloured ; beneath 

 black and shining ; lobes crowded, ascendant at the crenate, 

 smooth margins; apothecia adnate to the upper side of the 

 fertile lobes, ample; disk blood-red, and blackening; margin 

 crenulate. Spores ellipsoid, mic. Spermatia oblong, thick- 

 ening gradually towards one end. Tuckerm. Suppl. 1, 1. c. p. 



423. Platysma septentrionale, Nyl Syn. I, p. 315. 



Rocks, Kotzebue's Sound (Herb. Church. BaMngton), Tucker- 

 man I. c. 1858. Islands of Behring's Straits, Wright. Fertile, 



in Japan, Wright. The specific name (criticised byNylander, 



Syn. p. 315, where a name, published without character by him- 

 self, is substituted for it) is quite as good as chloantha, Ach. ; 

 and, like this, in entire accord with the usage of the language 

 from which the names are taken, as with that of other languages. 



20. C. Oakesiana, Tuckerm. ; thallus cartilagineous-membra- 

 naceous, foliaceous, for the most part rather loosely linear- and 

 long-lobed, but now more compact; from greenish at length 

 straw-coloured; beneath brownish, and fibrillose ; lobes sinuately 

 cut, flattish, but the margins soon elevated, and whitish-soredi- 



