370 CETERACH. 



Tlie obscure indusium is so marked a feature that I have 

 followed the latter authority, preferring this to the bolder 

 conception of uniting in one grand family such species as 

 A. marinum, Athyrium filix-fcemina, Diplazium striatum^ 

 Hemidicttjum marginatum, and Ceterach officinarum. 



Only one British species. 



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