ARTIFICIAL KEY. 13 



6. Pinnae not articulate to 

 rachis. 

 7. Indusium atta 



7. Indusium fixed 

 by base only, 

 or wanting .............. ASPIDIE^B 



5. Veins free, sori subterminal 

 or dorsal. 

 6. Frond quadripinnate, 



sorus naked .............. (20) Monachosorum 



6. Less compound, or 



with indusium .................. ASPIDIE^E 



5. Veins anastomosing ...................... ASPIDIEJE 



