CRYPTOGAMIA. ALGAE. 1938. Lichen, 1755 



fpadochrous. Cartilagino-membranous, rigid, peltate, with a plaited 

 and flightly-lobed circumference, grey-glaucous with raifed dots 

 above, black hairv with branched black fibres underneath: tu- 

 bercles becoming convex, circularly plaited. Hoffm. /. 2./. 3.4. 



+hirfutus+ Coriaceo-membranous, foftim, with a plaited irregular 

 repand reflected circumference, grey ifh -white with raifed dots 

 above, grey blackifh-brown hairy with nearly fimple fibres of the 

 fame colour underneath: tubercles becoming hemifphasrical, 

 circularly plaited. Jcl, Stock. 5. t 3./. I. 

 2. papyrius. Orbicular, urnbilicate, peltate, papyraceous, with a rounded" 

 Jobcd circumference, raked beneath, cinereous both (ides. 



Milieus, Membranaceous, peltate with a {talk, very large, with a 

 fligluly repand circumference, glabrous and fmooth above, hairy 

 with branched itraightifii fibres beneath, brownifh-grey both 

 fides: tubercles circularly plaited. Dill. t. 82./. 5. 



fnurinus. Membranous, peltate, with a plaited repand and {Tightly 



lobed circumference, with raifed dots both fides, moufe-coiour 



above, black- brown beneath: tubercles fcattered, rather convex, 



(lightly margined, circularly plaited. Aft. Stock. 5. /. 2/. 3. 



5. Tubercles nearly globular, blacky with 1 — 4 round hollow cells, 



each covered with a wart-like deciduous ltd', frond crujlaceous. 



Bathelium. 



niaftoideus. Erfufe, glabrous, fomewhat cartilaginous, uneven, olive- 

 brown: tubercles nearly globular, 1-3-celled, opening after th« lid 

 has fallen off. Achar. t- 8./. 3. 

 £. Tubercles roundifh-conoid, blacky formed under the frond which 

 they gradually elevate and penetrate y and with which they are more or 

 left invefledy generally vnth a central pore y fometimes entirely fall- 

 off and leavmg a holloiv: frond cruflaceous. 



Schmderi. Tartaroous, uninterrupted, whitiih: tubercles globular, 

 hail immerfed, urnbilicate, black. Schrad. 2. 7. 



grifeus. Effufe, uninterrupted or flightly cracked, grey, green with- 

 in: tubercles very minute, crowded, immerfed, rugged, warty, 

 becoming urnbilicate, black. 



*fufcelius. Thick, fmooth, areolate, grey, black within: tubercles 

 fiat, fomewhat immerfed, minute, black, without the central 

 pore. Eng. Bot. t. 1500. 



muralis. Effufe, leprous, fomewhat mealy, cracked, white: tubercles 

 immerfed, warty, black with white mealinefs, becoming urnbili- 

 cate and a little concave. 

 * z.tejfellatus. Leprous, very thin, tefTellate, greyifh, whitifh round the 

 tubercles : tubercles immerfed, convex, black, fmooth. E. Bot, 533, 



farreus, Effufe, leprous, mealy, pure white: tubercles crowded, fe- 

 miglobular, warty, black, pruinous. 



R25 



