188 



POPULAR HISTORY OP LICHENS. 



ceding chiefly in the upper surface of the thallus being 

 sraoothish and margined with golden-yellow soredia, the apo- 

 thecia marginal, and their margin sometimes golden-yellow. 

 (E. B. 2359.) 



It resembles the preceding also in its habitat and in 

 being rare in Britain. Like S. macrophylla, it is by some 

 regarded as a doubtful native. .We have seen it only from 

 the New Forest, Hampshire. 



Genus II. PABMELIA, Aek 



Gen. Char. Thallus foliaceous, prostrate, expanded horizontally 

 from a centre ; upper and lower surfaces differing in characters, 

 latter usually subfibrillose ; variously laciniate or squamulose. 

 Apothecium scutellate, sessile, superficial, varying in .colour, 

 and differing in colour from the thallus ; margins at first closed 

 or connive nt. (Name probably from parma, a round buckler, in 

 allusion to the appearance of the apothecium.) 



* Thallus laciniate-lohate ; lodes rounded, sub ascending . 

 1. Parmelia amplissima {amplus, large). Thallus grey- 

 ish-glaucous, membranaceous, besprinkled with blackish- 

 green glomeruli, — below brownish-tomentose (occasionally 

 with scattered cyphellse) ; lacinise elongated, sinuate-lobate, 



