Parmelia. Lecanaria. 



Icon. Hoffm. Pl. Lich. T. g. f. 3. Enum. Lich. 

 T. 4. f. 1. 



Habitat in saxis fe rupibus. 



Parmelta impolita: crusta contigua subpul- 

 verulenta aibida; scutellis,submimersis conve- 

 xis difformiBus cinereo-caesiis pruinosis, deter- 

 sis intusque ru-fis. 



Lichen impolitus Ehrh. Cr. Exs Lich.pru- 



inatus Pers. in Ust. Ann. d. Bot. St. 11. 

 p. 19. 



Habitat ad caudices Oucrcuum annosarum. 



Obs. Similis Parmelia glaucoma, at diversa. Cha- 

 racter specilicus in Lich. Prodr. p. 56. datus viti- 

 osus est Sc vjrieiatem Pa rm ..gla uco ma, tantum ex- 

 piimit. Etiarn delenda est obsei vatio ibidein iacta 

 SC ad varietatem P. glaucomcz relerenda. 



Parmelia glauco.ma crusta tartarea rimosa 



albo - cinerascente; scutellis demum convexis 

 congestis dilTormibus glaucis pruinosis tandem 

 nigiicantibus, margine fiexuoso crusta? conco- 

 iori. 



Lichen glaucoma. Lich. Pr. p. 56. L. impolitus 

 ibid. (excl. synonym.) Lich. sordidus Per- 

 Soon in Ust. Ann. d. Bot. St. 7. p. 26. 

 Lich. albido - cmsius Schrad. Spic. FJ. G. 

 p. s 7 Lic/i. rupico /<2?Linn.Retz.? Huds.? 



LlGHTF.? ROTH.? 



Icon. Hoffm. P. L. T. 52. 53. 



Habitat iri rupibus 8c saxis. 



Obs. Simillima Parm((Ii<E impo!it<z. Crustalara sub- 

 determinata. Scutellae juniores planae albido-cine- 

 reae vetustae convexa? hemisphasricce cassias. Sub- 

 stantia earurn interna alba nec rufescens ut in Parm. 

 impoiiia. — Variat crusta 8c scutellis passim o- 

 chreo-paiiidis (HorrM. 1. c, T. 52. f. 1.); Scutel- 



lis 



