210 



POPULAR HISTORY OF LICHENS. 



with in the shops of the London herbalists, being probably- 

 kept chiefly for the purposes of the bird-stuff er."^ 



15. Parmelia elegans {elegans, handsome) . Thallus ver- 

 milion or orange-red, membranaceous-cartilaginous, smooth 

 on both sides, white below, sometimes granulose above, stel- 

 late or radiose ; lacinise torulose, linear, lacinulate, somewhat 

 discrete, convex. Apothecium of similar colour to thallus. 

 (E. B. 2181, var. orbicularis.) 



Not uncommon on rocks and stones in lowland as well 

 as subalpine or alpine districts. It occurs on the granitoid 

 rocks of the summits of some of the highest mountains. 

 On Orizabo, it was found at an elevation of 14,850 feet ; 

 by Agassiz it was seen on the summit of the Jungfrau ; and 

 on other lofty mountains it constitutes the last form of vege- 

 tation, attaining a greater height sometimes than even Lea- 

 ded geographica. It occurs also in the Arctic regions. It 

 sometimes resembles, on superficial examination, small and 

 reddish varieties of the preceding species. 



Thallus squamulose ; squamules imhricate-lohate. 



16. Parmelia hypnorum. Thallus dull-greenish, be- 



* For references to the chemistry of P. parietina see Rochleder and Heldt, 

 Annalen der Chem. und Pharm., 1843 : Herberger, Buchner's Repertorium, 

 1834 : Schlossberger, Pharm. Journal, 1848. 



