THALLOGENS. ] 9 LICHENALS. 
ParmMewia, Acharius. 
Thallus leafy, horizontal, lobed, and cut. Shields orbicular, fixed by a 
central point, concave, bordered by the inflexed thallus. 
1. P. parietina Acharius.—(YeLtow Watt Licaen.) Fig. 36. 
Thallus circular, bright orange yellow; lobes radiating, appressed, 
rounded, crenate, and crisp, granular in the centre; shields deep 
orange, concave, with an entire border. 
Habitat. Trees and walls. Common. 
Quality. Bitter. Yields a yellow colouring matter. 
Uses. In intermittent fevers. 
ae Lecanora. Acharius. oe 
‘Thallus crustaceous, flat, uniform. Shields orbicular, plano-coneave, - 
__ thick, sessile, bordered by a rim formed out of the crust. — 
Se ea 
Various Lichens, natural size, 
arietina ; 37, Lecanora 
41. Peltidea caniz. 
; 38. Roccella fuciformis; 39. 
c2 - 
enomyce rangiferi pies eee oe 
