92 Mr. Turner's Descriptions of 



3. Lichen luteo-albus. 



L. crusta leprosa tenuissima alba; scutellis vitellinis; junioribus 

 planiusculis, adultioribua tuberculiformibus. 



Tab. VIII. Fig. 3. 

 Habitat in cortice arborum; prope Croydon, D. Dickson: in 

 insula Mona, D. Davies: in comitatu Durham, D. Harri- 

 rnan : apud Acle et Coltishall in Norfolcici. 



Crusta leprosa, tenuissima, alba, nitida, ab arborum, quibus in- 

 nascitur, truncis vix nisi colore dignosci potest. Hanc fere ob- 

 tegunt scutellse, ambitu subrotundae, numerosissimae, confertae, 

 magnitudine papaveris seminum, initio planiusculae, vel levis- 

 sime concavse, margine tenuissimo, et si per lentem attente ob- 

 serventur, pallidiore cinctae; prOgrediente oetate, tuberculorum 

 formam aemulantes, et saspe, dum madent, subglobosae. Sic- 

 cata? fiunt compressse. Color his plerumque vitellinus inter- 

 dum aliquantulum virescit. 



Among the crustaceous Lichens scarcely any subdivision is at- 

 tended with more difficulty than that with yellow shields; for 

 what some authors have considered as varieties of Lichen can- 

 delarius*, and others have regarded as distinct species, are so nu- 

 merous, and occur in so many different forms, that this single 

 circumstance has given rise to an infinity of perplexity. It is 

 not, therefore, without the greatest diffidence that I now hazard 



* In speaking of L. candelarius, I think it necessary to observe, that I do not intend 

 the plant so called by Dr. Acharius, but that which Professor Hoffman has figured in 

 his PlantcB Lichenosce under the name of L. vitellinus, and which by Mr. Dickson and 

 most other botanists is considered the true L. candelarius* 



the 



