«49 CRYPTOGAMIA AL<5.^. 



der on the margins, there are fometimcs found 

 in the fat;} e fpecimens, but more commonly in 

 dijlin^ ones, upon the difc of the leaves, many 

 plain farinaceous tubercles. 



The fliiclds are very rarely feen, notwithftanding 

 the plant is fo common. 



They are large, concave, and fupported on fliort 

 pcduncies. Their infide is fmooth and fulcous, 

 their outfide of the colour of the leaves, wrin- 

 kled in the dry plants, fmooth in the frefli ones, 

 and their margins lobed in the old ones. 



Hence it appears that this differs chiefly from thp 

 preceding in not having the upper fide of the 

 leaves glofiy, in haying their under fides hairy, 

 their margins elevated and tumid with Farinay 

 and in producing fometimcs, tho' very rarely, 

 large ihields, fupported on fliort peduncles, 

 which have never yet been difcovered in the 

 former. 



vefpertilio L. gelatinofus membranaceus rugofus lobatus atro- 



52. viiens, fcutellis confertis rufis. L. nigrefcens. 



Hudf. FL J fig. 4 so. {Dillen. mufc, t, 19. /. 20. 



opt.) 



Bat's-wing Lichen. Anglh. 



On trunks of trees frequent, efpecially on the 



north fide, and fometimes upon rocks. 

 This confifts of thin, wrinkled, membranaceous, 

 and gelatinous leaves, expanded in a circle, of 

 a black green colour, rcfembling a bat's wing, 



fiightly 



