116 BRITISH FERNS, 
living than in the dried plant, and sometimes impart 
to it a glaucous hue. 
The Rigid Fern is a native of Hungary, Germany, 
France, Italy, Russia and Siberia; but has not been 
discovered in North America, the fern so named by 
some American botanists being totally different. It 
is confined to limestone rocks in mountain districts. 
ot and Hutton Roof ; in Yorkshire, on Ingle- 
borough, and abundantly in the fissures of the lime- 
Stone rocks near Settle, at an elevation of 1550 feet 
above the level of the sea, and 1050 feet above the 
town of Settle, and also on the rocks called White 
Somersetshire or Irish localities, 
