CLASSIFICATION. 33 



S^ore-cases naked. 



Spore-tufts circular and distinct . . Polypodies, 

 Spore- tufts running together . Parsley Fern, 

 Spore-tufts elongated . • . Jersey Fern, 



Spore-cases covered. 



With a proper cover : 



Spore-cover kidney-shaped, attached at the edge, 



Boss Ferns, 

 Spore-cover circular, attached at the centre, 



Shield Ferns, 



Spore-cover kidney-shaped and fringed, Lady Fern, 

 Spore-cover straight, opening towards the mid-rib, 



Spleenworts, 



Elongated tufts of spore-cases in pairs, side by side, 

 covers opening down the .middle — Harfs Tongue, 

 Tufts of spore-cases concealed amongst brown scales, 



Scale Fern. 

 Tufts of spore-cases arranged in a long line. 



Hard Fern 



"With a false or imperfect cover : — 



Termed from the reflexed edge of the frond. 



Bracken, 



Formed from reflexed lobes of the frond. 



Maidenhair, 



Spore-cover forming a hood . . Bladder Ferns, 

 Spore-cover cup-shaped and fringed . Woodsia. 



In the following the ring is oblique : 



Spore-cases contained in a cup-shaped receptacle. 



Filmy Fei nSi 

 Spore-cases contained in a two-valved receptacle. 



Bristle Ferns. 



