ON THE CLASSIFICATION OP FEKNS. 99 



Fronds more or less divided, the lowest pinnas 

 larger, on longer stalks, or more divided 

 than the others. 



Frond 6 inches to a foot, shining green, ) ASPLENIUM 

 with numerous lanceolate pinnas and > ADIANTDM 



sessile segments ) NIGRUM. 



Frond 3 or 4 inches, with few small, stalked 

 segments. 



Segments obovate J S ^ENIUM 



j RUTA-MURARIA. 



Segments narrow-oblong. . . . . j ASPLENIUM 



j GERMANICUM. 



Segments linear . , . j ASPLENIDM SEP- 



J TENTRIONALE. 



H 2 



