CRYPTOGAMIA ALGyE. 839 



^''"-e curLd maigins of the fegnjents are Qightly 

 farjnacecus, but no other pare ot the leaves. 



The Ihields we have never yet feen. DiUenius 

 defcribes thetn as extremely fmall and fulcous, 

 but fuppofes that they v/ere not arrived to rheir 

 full fize. 



It is lo nearly related to the Lichen pcrlatus next 

 defcribed, that I am tempted to think it may 

 be only a variety of it. 



,1 L. foliaceus repens lobatus glaber, fubtus atrL% 

 icutellis pedunculatis integris. Hudf. Fl. Af-j. 

 448. Lin, fyfi. edit. 13, -p. 8c 8. {Michd. ge;i. ;. 

 50. ord. 24./. I. Vail. Parix, /. 21. /. 12. Dil- 

 kn. mi'.fc. t. 20. f. 39. A-E. opt.) 



Common blue curled Lichen, jinglis. 



Upon the trunks of oaks and other trees rery 

 comimon.. 



The leaves are of a glaucous colour when m.oiil, 

 of a whitiih alli-colour when dry, Imooth oa 

 the furface, but not glofly, divided into obtufe 

 fmuared figments, elevated and curled on the 

 edges. The under \\d^^ jud at the extremities, 

 is imooth and of a brownifh black, all the reil 

 quite black,, rough and hairy. 



But the principal character of this fpecies is, that 

 the meandering margins of the interior leaves 

 are elevated and rciicxed, and fweli'd with a 

 vvhitifii farinaceous powder. Befides wljich pow- 



