74 CRYPTOGAMIA LICHENES. 



roundish, deep orange-brown with a buff border, ascending, and 

 often revolute. HOOK. Scot. ii. 60. Lichen caninus, WITH. iv. 

 74. LIGHTF. Scot. 845. E-ng. Sot. t. 2299. Peltigera canina, 

 xSpRENG. Syst. Veg. iv. 305. DILL. Muse. t. 27- f. 102. 



Hab. On grassy banks, heaths, and about the roots of old 

 trees, common. 



The frond is a large leather-like irregularly lobed leaf, wrin- 

 kled, and generally furfuraceous on the upper surface, 

 loosely adherent to the ground by the long subulate pro- 

 cesses which proceed from the veins beneath. The shields 

 are large, plane or revolute, " shaped like the human nail." 

 The powder of the dried plant was celebrated by Dr MEAD 

 as a certain cure for canine madness. The history and 

 receipt may be seen at length in the wtirk of DILLENITJS. 



2. P. rufescens, frond even, reddish-brown, irregularly lobed, 

 beneath fawn-coloured, downy, scarcely reticulate ; lobes rounded, 

 with reverted edges ; apothecia deep reddish-brown, plane, thin, 

 revolute, with a buff entire border. WINCH Guide, ii. 61. P. ca- 

 nina,) var. rufescens, HOOK. Scot. ii. 60. Lichen rufescens, WITH. 

 iv. 76. Eng. Bot. t. 2300. 



Hab. On earth-capt dikes, banks, &c., not uncommon. 



The under surface of this species is almost equally covered 

 with a buff-coloured short down, without any subulate pro- 

 cesses. The shields are on short lobes, and numerous. 



3. P' spuria, glaucous-green, smooth, beneath white, with 

 brownish inosculating veins ; apothecia on narrow elongate lobes, 

 revolute, umber-brown. Loud. Encyclop. No. 15611. MOUG. and 

 NEST. 837. DILL. Muse. t. 28. f. 108. 



Hab. On heathy ground, not common. Sea banks near 

 Berwick. 



Our specimens agree precisely with those in the work of 

 MOUGEOT and NESTLER, and with specimens from ACHA- 

 mus, in the herbarium of Mr WINCH. It is a small spe- 

 cies, pushing forth numerous narrow oblong lobes, each 

 terminated with the involute shield. The under surface 

 is scarcely pubescent, white, reticulated with slightly raised 

 brownish veins. This and the preceding are probably 

 merely different states of the first species* 



