CRYPTOGAMIA. ALGAE. 1738. Lichen. 1743 



193S. LICHEN. Fructification in tubercles or fhields, in- 

 verted with their proper cortical receptacles, on a varioufly 

 formed and conftructed frond. 



A. Receptacle y or outer coat of the frudif cation, compatl, hardijb, of 



a different fub fiance fr fm the frond. 

 1 .Shields black: flat> oblong, elliptic, linear or vari oujly formed, open- 

 ing longitudinally, Jimple or confluent, or branched: frond crujia- 

 ceous. Opegrapha. 

 Ptrfoonii. Leprous, whitiih: (Yields fimple, oblong, turgid, fomewhat 

 imprefTed, rugged: Achar. 

 2* Somewhat mealy, unequal: lhields raifed, fiexuous, plaited. 

 nethus. Leprous, thin, whitifh, fomewhat mealy : ihieids fimple, 

 broadifh, rounded-deformed.. Perfoon- t- 2./. 4 -a. b 



2, turgidus. Shields fcattered, railed, tumid; the larger-ones roundifh and 



elliptic. 



3. cenfertus. Dull-grey, fomewhat membranaceous: fhields oblong, minute, 



tumid, crowded- 



4. ^«/r<a/«j 4 Grey-brown, fomewhat mealy: fh'eMs roundifh, a little rugged 



5. fpanwtus* jGreyifh- white, rather poliihed.* fhields few, minute, fcattered, 

 elliptic. 



nimbofus. Leprous, rugged and cracked, glabrous, pure white : 

 fhields fimple, roundifh, oblong, minute, much crowded. 

 J char. tab. u f. 8. 



diaphorus. Dirty greyifh-whhe, glabrous: fhields firrvple, lrh*qua1; 

 lefTer-ones oblong- elliptic; larger ones long, fiexuous. Achar. 

 2. tignatus. Glaucous-white: fhields long, fiexuous. 



ellipticus. White, thin, a little rugged: fhields fimple, minute, el- 

 liptic, raifed, fcattered, with a concave mealy disk. Achar. 1.9. 



*betuligneus. White with a black border, very thin, broad: fhields 

 fimple prominent, long-elliptic, nearly ftraightand parallel, 

 Pers. t. $.f 3. A. a. 



parallelus. Pure white, fmooth: lhields fimple, emerging, linear- 

 elliptic, flat, fhaight, pointed, parallel, black-brown, naked 



vulgatus. Greenifh-white, fquamular, fomewhat mealy ? fhields 

 fimple, minute, oblong, linear, fomewhat- riexupus, crowded; 

 margin a little inflected; difk very narrow. 



rubellus Reddifh-brown, a little rugged, bordered : mields fimple, 

 roundifh, oblong, here and there ilexuous. Pers. t. 1. /. 2. A a. 



2. drymeus. Reddifh grey, fomewhat mealy: fhields long, f?exuqus< 



3. decoloratus. Reddifh -g:ey, a litde mealy; fhields roundifh and rather 



oblong, crowded, 



4. viridis. Grcenifh-brown, leprous: mields apprclled, roundifli, oblong 



and deformed. 

 profodeus. Grey greenim-brown, contiguous, unequal: fhields fim- 

 ple, linear, turgid, rugged, fcattered, fomewhat ilexuous, with an 

 inflected connivent Dorder. 



