1756 CRYPTOGAMIA. ALGAE. 1938, Lichen. 



trachonus. EfFufe, mealy, green: tubercles very minute, nearly g!o 



bular, umbilica:e, black. 

 viridulus* EfFufe, uneven, teffcllate, olive green: tubercles prominent, 



hemifpasrical, warty, black. Schr. t. 2/. 4. 

 ttraSfinus. Thin, finely cracked, rough with raifed dots* black: tu- 

 bercles conic, piano impreifed at top, black. 

 athiobolus* Thin, hardly interrupted, with very minute raifed dots, 



umbre: tubercles hemifphcericai, turbid, umbilicate, black, po- 



limed. 

 lithinus. Thin, a little rugged, biackim-grey: tubeicles very minute, 



hcmifphccrical, entire and warty, at length with a central pore, 



black, opafce. 

 hyffaceus. Thin, white, fomewhat mealy: tubercles minute, a Jitt'e 



immerfed, umbilicate, black. Welg t. 2/. 9. 

 hutocephailus. Thin, greyifh-grey: tubercles crowded, prominent, 



nearly globular, umbilicate, black, white-mealy. Hoffm. r. 2. /'. 2. 

 3. ampbiboluu Mea 1 y, blueifh- white ; tubercles with a biaeifh- white 



mcdlinc^. 

 Jligmatelus. Very thin, membranaceous, frnooth, rather polilhed, 



greyifh: tubercles minute, convex, warty, black. Schrad. t. 2 /. 2. 



2. atomariui. Very thin, even, 'pale glaucous -grey: tubercles plano-convex, 

 umbilicate, blackifh. 



3, ^remittor. White, uneven, cracked: tubercles very minute, much crowd- 

 ed, flattifh, umbilicate, black. *» 



melaUucus. Thickifh, white, rather poli fried: tubercles fcattered, he- 

 mifphxrical, warty, black. Schrad t 2 /• 3 



fli&uus. Very thin, fomewhat membranous, tranfparent, flightrj 

 wrinkled: tubercles minute, globular, fuperficial, umbilicate, 

 black. 

 2. tninutiss'tmus. Very finely wrinkled in a fibrous manner, g r ey: tubercles 

 nearly globular, very minute, thickly crowded, umbilicate, black 



Epidcrmidis. Very thin, eftufe, milk-white: tubercles crowded, 

 roundifh-oblong, planodepreffed, rather convex in the centre, 

 warty, black. 



Cereji. Very thin, fomewhat determined, tranfverfely oblong, greyifh- 

 white, polifhed: tubercles fcattered. elliptic, convex, umbilicate, 

 black. ' 



puncliformis. Very thin, fomewhat determined, frnooth, rufous- 

 brown: tubercles minute: hemifphasrical, umbilicate, black. 

 2. ptelaodtt. ' Very thin, grey-brown: tubercles minute, fomewhat elliptic, 

 rather convex, umbilicate, black. 



analeptus. Somewhat determined, very thin, glabrous, olive: tuber- 

 cles fcattered, hemifphaerical-ccnic, warty, black. 

 Schrad. /. 2. 'f. I. ' 



mamillanus. EfFufe, cartilagino-membranous, frnooth, greenifh v 

 tubercles fcattered, rather convex, depreffed in the circumference* 

 elevatedand warty in the centre, black. Jchar. /. 3./. 2. 



