CRYPTOGAMIA LICHENES. 99 



the Ye&feltspar of the granite, upon which the plant grew, 

 was most predominant. Travels, part i. p. 565. WE STRING 

 found it extremely rich in colouring matter, and recom- 

 mends it to the particular attention of those who practice, 

 and who wish to improve, the art of dyeing. A short ab- 

 stract of his experiments is given by Mr NEILL in the Edin- 

 burgh Encyclopaedia. 



57. GYROPHORA. 



1. G. proboscidea, frond a circular concave leaf adherent by the 

 centre, of a brownish -black colour, more or less torn and plaited 

 at the margin ; upper surface sprinkled with small inconspicuous 

 tubercles, wrinkled and lighter coloured "in the middle ; beneath 

 brownish, smooth Eng. BoL t. 2484. (The figures agree well 

 with our specimens.) HOOK. Scot. ii. 41. Lichen deustus, LIGHTF. 

 Scot. 861. 



Hob. Rocks near the summit of Hedgehope. 



2. G. cylindrica, umbilicated, irregularly lobed, dark greenish - 

 grey, fringed with black rigid hairs ; tubercles elevated, nearly 

 plane, with concentric and plaited lines. HOOK. Scot. ii. 42. G. 

 proboscidea, WINCH, Guide, ii. 43. Lichen crinitus, LIGHTF. Scot. 

 860. L. proboscideus, Eng. Bot. t. 522. DILL. Muse. t. xxix. 

 f. 116. 



Hal). On Cheviot, Winch. Near the summit of Hedge- 

 hope, plentiful. 



Used as food in Iceland ; as also for dyeing woollen stuffs of 

 a brownish-green colour. 



58. OPEGRAPHA. 



1. O. Persoonii, crust thin, whitish, leprous, undefined; apothe- 



oia raised, aggregate, somewhat branched, linear, black, rugose 



Eng. Bot. t. 2345. HOOK. Scot. ii. 42. 



Hab. On sandstone rocks at Hudshead, and on stone walls 

 in the vicinity, abundant. 



The apothecia are generally, as it were, heaped upon one 

 another, and assume a star-like form. 



E2 



