Europe. In the Russian dominions, the only station known is 
Kamtschatka ( Mertens ). We possess five specimens from the 
east side of the Rocky Mountains, gathered by Drummond. 
Plate 25. Fertile plant of Cgstopteris montana,~Be rnh .,—natural size. Fig. 1. 
Fertile pinnule,— magnified. 2. Single sorus, with involucre,— magnified. 3. In¬ 
volucres,— magnified. 
