132 HISTORY OF BRITISH TERNS. 



downwards as much or perhaps more than it does towards 

 the point. The pinnse generally stand opposite, and are 

 narrow, tapering, and pinnatifidly divided, bearing their 

 fructification almost close to the margins of the segments, 

 and generally very abundantly. 



In this species the divisions of the fronds are flat, not 

 revolute, as in L. Thelypteris, which most resembles it. Each 

 segment or lobe has a distinct and slightly sinuous midvein, 

 which is alternately branched, the branches simple or divided, 

 and bearing the spore-cases in clusters near their extremity. 



This plant loves shade, and is found most luxuriant in 

 woods, occurring also on mountainous heaths. It may be 

 considered a common plant in England, Wales, and Scot- 

 land ; but in Ireland is much more rare. It is an effective 

 plant for shady rock-work, and, when established, grows 

 freely. 



Besides the name we have here adopted, this Fern has 

 borne the following titles : AspiMum Oreopteris, Polypo- 

 dmm Oreopteris, Poly podium montanum, Polystichum mon- 

 tanum. 



LASTREA RIGIDA, Presl. The Rigid Fern. (Plate IX. 



% i.) 



This very elegant Fern is of moderate size, growing nearly 



