CRYPTOGAMIA. ALGAE. 1938. Lichen. 1761 



gibbofus. EfFufe, glabrous, greyifh-white, with globular-conoid 

 gibbofities bearing the iliields : fhields black, with a flightly 

 infiedled crenulate margin, 

 fimbrlatus. Warty, grey biackiih-brown, with a radiately fringed 

 circumference; warts grey, bearing the fhields: fhields black, 

 with an entire margin. 

 *Hoffmanni. EfFufe, warty, green ifh-^rey; warts crowded, lead- 

 colour, plano-deprefTed, bearing the fhields on *a protuberance 

 in jhe middle : fhields brownifh, with a mealy-wrinkled paler 

 margin, 

 . 2. contortus, Cruft hardly any or black, with nearly diftincl: and confluent 



fpirally twifted whitifh warts : fhields black. Hoffm. t.zz.f. 1 — 4. 

 exanthematicus. Thin, uninterrupted, greyifh: fhields minute, with 

 .a doled infie&ed connivent radiately cracked paler margin, be- 

 coming expanded and yellovvifh-flelh-colour. 

 Linn* Trans. 1. /. 4. f. 1. 

 panyrgus. EfFufe, granular-warty, pure white; warts cluttered, bear- 

 ing the fhields.- fhields glaucous mealy, with a convex entire mar- 

 gin. Achar. t. 4../. 2. 

 *fcrupofus. EfFufe, tartareous, wrinkly-plaited, granular, greyifh - 

 white: iliields cup-lhaped, black, with a tumid inflected flightly 

 crenate margin. Eng. Bot. t. 266. 

 2. albisstmus. Somewhat contiguous, mealy, pure white: fhields glaucoua- 



rriealy . Hoffm, t. 1 1 f. 1. b? 

 3. plumbeus. Smooth, granular, lead-colour : fhields much crowded, 

 minute, black, with a raifed flightly crenate proper margin. 

 Hoffm. tab. 11 ./. 1 c? 

 4. argillofus. Thin, granular, greyifh: fhields glaucous-black, with a 



railed proper margin difttnft from the frond. 

 r. hnopbyllus. Granular, uneven, greyifh, with a flightly lobed foliaceous 

 circumference: fhields glaucous black, with a flattifh difk, and nearly 

 diilinft margin, Hoffm /. 21./. 1. 

 cinereo-cajius. Leprous, fomewhat mealy, greyifh-white: fhields 



glaucous-blue, with a crenuiate margin. 

 excavatus. Leprous, cracked, mealy, whitifh-grey : fhields black, 



margined. 

 geolcus'. Leprous, uneven, fomewhat granular, grey: lljields much 



crowded, minute, fomewhat gelatinous within, grey. 

 foveolaris. Leprous, uneven, very finely granular, tefFellate: fhields 



impreff:^ pale, at length, a. little emerging and margined. 

 agelaus. EfFufe, thin, fomewhat membranous, uneven, fmooth, fruf- 

 tular-cracked; grecnifh-white: fhields crowded, impreffed, black 

 with white meaiinc fs, with a raifed irregular margin. 

 *Acharii. Determined, glabrous, finely cracked, pale teftaceous : 

 fhields cup-fhaped, reddifh, at length with a fomewhat raifed 

 margin. Eng. Bot. t. T087. 



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