CRYPTCGAMIA ALGJE. 86i 



We have received this Lichen from feveral of our 

 friends under the name of L. prohfcideuj, of 

 Limiifus^ with which it by no means agrees, 

 either according to the figure ofDiUemus, quoted 

 by LinnauSy or Dillenius\ fpecimens correspond- 

 ing to that figure, which we carefully examined 

 at Oxford. 



If therefore the plant nov/ defcribed be the fame 

 yjKioh Linna us intended for his l^. probofcideus^ 

 he has quoted a figure that has no refcmblancc 

 to It, and neglecfted others of the fame author, 

 which are very good, and exactly tally with it. 



In the midft of thefe uncertainties we judged it the 

 beft method to give a new name and defcrip- 

 tion to a doubtful plant, and to apply fuch 

 figures as are juft and good, and which wc are 

 fure belong to it ; which will be the n^eans of 

 cftablifhing certainty for the future. 



ditijius 6^. L. umbilicatus undique Isvis. Sp.pLiGiS. {Vail. 

 pnris. t. 21. f, 14 ? Dilien. t. 30./. 117.J 



Black-grey Lichen, with little black warts. Anglis. 



Upon the highland rocks with the preceding. 



It confifts of a fingle urubilicated concave leaf, of 

 a blackirh or fmoky grey colour, a little wrin- 

 kled or fhriveHed on the upper fide, but quite 

 fmooth and without radicles on the under fide, 

 and the colour a iitrle paler towards the centre. 



The fruct'.Mcations are very minute, black tuber- 

 cles. 



