CRYPTOGAMIA. ee 
ins. Cetraria nivalis and Sticta pulmonacea may be used 
r the same purpose. 
Mepictnat Properties.—Cetraria islandica is a useful 
mulcent, and has been recommended in cases of emaciation, 
account of its nutritious virtues; and also in catarrh, 
moptysis, diarrhoea, and dysentery. Peltidea aphthosa 
ichen aphthosus), according to Linnzus, is used in Sweden 
cure the aphthe or thrush in children; it is purgative. 
onia sanguinea is used for similar purposes in Brazil. 
Lindley mentions Parmelia parietina, Borrera furfura- 
Everina prunastri, and Cenomyce pyxidata and C. coc- 
a, as possessed of astringent and febrifuge qualities. 
The medicinal properties of the Lichens,” says De Can- 
le, in his essay on the Medicinal Properties of Plants, 
reside chiefly in those of a soft consistence, perhaps because 
*y contain most mucilage. They all have more or less of a. 
taste ; appear to be composed of mucilage, of a small 
antity of resin, but chiefly of a substance of an animal na- 
ture analogous to gelatine: the most of them are demulcent, 
sefully employed in decoction in diseases of the lungs, and 
ble of supplying food for man, as by steeping or repeat- 
boiling their bitterness may be removed.” —Essai, p. 
Officinal Plants. 
Cetraria islandica (Lichen islandicus.) 
Rocella tinctoria. 
