PAKMELIA. 



191 



land regions, but rarely found fertile ; on moist and shady 

 rocks the surface of the thallus often becomes thickly gra- 

 nulose-pulverulent. In the north of Ireland, under the 

 name of " Stone crottles/' and also in the Isle of Man, it was 

 used by the peasantry to yield a lemon-coloured dye for 

 woollen fabrics. It occurs on the Himalayas, on the west 

 coast of South America, in Van Diemen's Land, and other 

 parts of the world. We have seen it in fine fructification 

 from the Pentland Hills, near Edinburgh. 



4. Paemelia l^te-virens {vireo, to be green). Thallus 

 membranaceous, smooth, dull green, becoming pale-brown 

 when dry, — below brownish- tomentose, rarely cyphellate ; 

 lacinise sinuate- repand, rotundate-lobate. Apothecia reddish- 

 brown ; margin entire or crenulate. 



Its common form, var. lierbacea, has a simple, orbicular, 

 broad-lobed thallus. 



A not uncommon corticolous and saxicolous species in 

 moist, shady places, in lowland and subalpine districts. 

 Its spores are broadly fusiform or ellipsoid, rounded at the 

 ends, bilocular or uniseptate and pale lemon-yellow. The 

 characters of the spores as well as the occasional pre- 

 sence of cyphellse justify, in our opinion, the older authors 

 in placing this species in the genus Sticta, under the name 



