RIGID SHIELD FERN. 23 



bruised. The veining is similar to that of the large 

 variety of Aspidium Filix Mas. The fructification is 

 borne on the lowest anterior branch of each venule. 

 The indusium is conspicuous and persistent. 



This seems to be a very local species, being almost 

 exclusively confined to the mountainous districts of 

 the north of England. It was first discovered as a 

 British fern by the Rev. Mr. Bree, at Ingleborough, 

 and has since been found abundantly in the limestone 

 districts of Yorkshire and Lancashire. 



It grows with vigour in common garden soil, re- 

 quiring no shade, but enjoying moisture. Its culture 

 is similar to that of the other large-growing kinds, the 

 only important points being to secure moisture and 

 good drainage. The introduction of limestone in its 

 bed is suggested by its natural habitat ; but this does 

 not seem to be essential to success. It is not one of the 

 most attractive of the ferns, but is valuable in group- 

 ing, as forming a contrast with the more ornamental 

 species. The rhizome should not be buried, but the 

 crown left above the surface. 



