THALLOGENS. 267 
domestic economy, some in the art of painting. The Iceland 
Lichen (Cetraria Islandica), Fig. 334, is demulcent, and is em- 
Fig. 334.—Cetraria Islandica. 
ployed in many affections of the chest; the great quantity of 
fecula which it contains renders it esculent. Sticta pulmonaria 
Fig. 335.—Sticta Pulmonaria. 
(the Lung-wort lichen), Fig. 835, is in Siberia a substitute for 
© hop in the preparation of beer. Cladonia rangiferina is an 
ot substitute for pasture to the reindeer, whose instinct 
y vers it even under the snow. 
