S!8 CRYPTOGAMIA ALGi^. 



cynplaiodcs. L. imbricatus, foliolis miiltifidis glabris obtufis 

 ^^*. . . Ipadiceo fulcis, pundlis vagis eniinentibus. Sp. 



s '■'-.: ■'-:':. pL i6og. {Fail. Paris, i. 20. f. lo. bona. Dilkn, 

 ., , • mufc. t. 24./. 80. A.-D.) 



Dark purple Dyer's Lichen, Cork or Arcell. 

 • '-' Ar.giis. ■•; ■ ' 



■•-■'■ Crotal. Gaulis. 



Cen-cerig. Cen du. Camhris* 

 Upon rocks frequent. ' •• ^ 



This is fo very like the preceding, except in co- 

 '\' ■""■' lour, that I have often been tempted to think 

 it only a variety of it. It differs however in 

 . " ■ "' ; the following refpeds : 



■' "It forms a thick widely-expanded cruft, of no re- 



.. , g>-l^i* figure, compofed of numerbus imbricated 



leaves, of a brown or black purple colour, di- 



'■ •' vided into Imaller fcgments than the preceding-, 



which fcg;ments are (generally bifid at the extre- 



mity, and the black rigid hairs on the under 



fide approach fo near their edges as to be vifible 



without turning the leaves. Add to this, that 



..*..■ r;:: the furface of the leaves is more fmooth and 



■* • ' ■ Ibining, and fcarce vifibly pitted, but only 



^ '■ •"" fprinkled with numerous fmall white dots, or 



fcratches. 



•• • The fhields arc of the fame colour, and very like 



■ the preceding, their margins a little crifped, and 



turned inwards, their outfide alh-colour'd. 



This 



/ 



