ACOTYLEDONS. LICHENS. Cenomyce. 61 



Formerly used, at the suggestion of Dr. Mead, as a cure for the bite 

 of a mad dog, but without success. 



6. P. poiydactyla, thallus glaucous green naked glabrous with 

 brown reticulated veins beneath, fertile lobules very numerous 

 elongate and as well as the brown terminal apothecia cucul- 

 lato-revolute. Ach. Syn. Lich. p. 248. Lichen canim/s, y. 

 Lightf. p. 846. Lichen polydaclylus, Jacq. Coll. 1. 14. f. 2. 

 a. 6. 



HAB. On the ground, but rather rare, Lightf. 



22. NEPHROMA. 



Universal recepta cle foliaceous,coriaceo-membranaceons, spread- 

 ing, lobed, free, and naked, or hairy beneath. Partial recept. 

 resupinate (on the underside), formed upon a produced por- 

 tion of the upper surface of the thallus, reniforrn, adnate, 

 coloured, plane, its margin of the same substance as the 

 thallus. 



1. N. resupinata, thallus greyish brown pale pubescent and gra- 

 nulated beneath, fertile lobules very short, apothecia large nu- 

 merous reddish. Ach. Syn. Lich. p. 241. Lichen resupi- 

 natus, Lightf. p. 843. E. B. t. 305. 



HAB. Rocks among moss., on the stems and roots of trees, not un- 

 common. Dumbarton castle, Sir J. E. Smith. Sides of Loch Lo- 

 mond, at Inverary, and in Aros Mull, Mr. Turner and Hook. 



Readily distinguished as a genus from the last, by bearing its apothe- 

 cia on the under instead of the upper side of the thallus. 



23. EVERNIA. 



Universal receptacle subcrustaceous, branched, and laciniated, 

 angular or compressed, nearly erect or pendulous, with a cen- 

 tral thread within. Partial recept. scutelliform, sessile, the 

 disk concave, coloured with an inflexed margin formed of the 

 thallus, 



1. E. prunastri, thallus greenish white segments dichotomous 

 multifid ascending linear-attenuate plane pitted, grooved and 

 white beneath, apothecia bright brown concave. Ach. Syn. 

 Lick. p. 245. Lichen prunastri, Lightf. p. 835. E. B. 

 t. 859, and 1.353 (Lichen stictoceros] . 



HAB. Branches of trees, common. 



SECT. III. CEPHALOIDEI. Apothecia subglobose, terminal on the 

 Ir (inches or Podetia of the thallus, or scattered, sessile, im- 

 marginale. 



A. Apothecia covered ly the mass of fructification. 



24. CENOMYCE. 



Universal receptacle Crustacea-cartilaginous, foliaceous, laci- 

 niated, subimbricated, free (rarely adnate, uniform, or want- 



