i;<> CRYPTOGAMIA-LICHENES. 



Grows in circular closely adherent patches ; the lobes plane, 

 broad, rather glossy, smooth, or much granulated and rug- 

 ged in the central parts ; under surface blackish -brown, 

 tawny at the edges ; tear white. A variety is occasionally 

 found in shaded woods of a pistachio. green colour. 



2- P. parietina, imbricated, saffron-yellow ; the lobes crisped, 

 obtuse, paler beneath; shields reddish-orange. HOOK. Scot. ii. 

 32. Lichen parietinus, LIGHTF. Scot. 822. WITH. iv. 36. Enp. 

 Bot. t. 194. DILL. Muse. t. 24, f. 76. 



Hob. On stone walls, on trees, and in hedges, where 



" The yellow moss in scaly rings 

 Creeps round the hawthorn's prickly bough." 



Very common and very conspicuous from its bright colour. 

 On walls the patches are always circular, but small branch, 

 es it encrusts in an irregular manner ; and if in the shade, 

 the frond acquires a tinge of green, when it becomes the 

 Lichen juniperinus of LIGHTFOOT. The shields are cup- 

 ped or saucer-like. " It is affirmed," says LIGHTFOOT, " to 

 dye a good yellow or orange-colour, if fixed with alum.*' 

 Children, in our younger days, used to dye their eggs of a 

 yellow colour with it at the time of Easter. 



3. P. aquila, imbricated, somewhat cartilaginous, greenish - 

 brown; segments narrow, many-cleft, convex, those of the cir- 

 cumference appressed, paler beneath ; shields blackish brown. 

 HOOK. Scot. ii. 54. Lichen pulhts, LIGHTF. Scot. 825. L. obscu- 

 rus, WITH. iv. 30. L. aquilus, Eng. Bot. t. 982. DILL. Muse. 

 t. 24, f. 69. 



Hob. On rocks at the sea-side, plentiful on many parts of 

 the Berwickshire coast. Hudshead, and on the Fern 

 Islands, N. Durham. 



Grows in rather thick circular patches, adherent everywhere 

 to the rock, of a dull brownish-green colour when recent 

 and moist, but tawny-brown when dry. The segments are 

 narrow, paler beneath, with black fibres ; those of the cir- 

 cumference radiating and closely appressed. The shields 

 are in general very numerous, placed in and towards the 

 centre, saucer-like with a thickened border. In old age 

 the central portion frequently disappears. The figure in 

 Eng. Botany must have been coloured from a dry cabinet 

 specimen. 



