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KEY TO THE GENERA OF ASPIDIEAE. 



Veins normally free, simple, forked, or pinnately branched. 

 Indusium normally absent. 



Sori more- or less elongate Leptogramma J. Sm. 



Sori round, pnnctiform. 



Margins of segments plane, herbaceous.... 



Phegopteris Fee. 



Margins of segments widely inflexed. membranous. 



Plecosorus Fee. 



Indusium orbicular, centrally peltate. 



Pinnae continuous with the rachis ; texture firm, more or 



less coriaceous Polystichum Roth. 



Pinnae articulated with the rachis. easily caducous, tex- 

 ture thin herbaceous CyclopEltis J. Sm. 



Indusium oval, attached by a central axis to a thickened lin- 

 ear receptacle Didymochlaena Desv. 



Indusium cordato-reniform, attached by the sinus. 



Leaves simple, pedate : veins obscure. .Camptodium Fee. 



Leaves compound, pinnate ; veins distinct 



Dryopteris Adans. 



Veins pinnate, usually uniting into simple areolae especially to- 

 ward the outer margin, atypically free. PhanerophlEbia Presl. 



Veins connivent. i. c, the branches from contiguous pinnace 

 groups uniting to form one or more arches 

 Indusium normally absent. 



Sori round, punctiform Goniopteris Presl. 



Sori elongate on the more or less parallel transverse 



arches Meniscium Schreb. 



Indusium cordato-reniform. attached by the sinus. . 



Cyclosorus Link. 



Indusium oblong, attached longitudinally by the center. 



Mcsoclilacna R. Br. 



Indusium orbicular, centrally peltate Cyclodium Presl. 



Veins forming a single row of areolae next the midrib with free 



included veinlets, indusia elongate-cordate : leaves simple. 

 Fadyenia Hook. & Bauer. 



