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(noun) one of a number of families into which the family Polypodiaceae has been subdivided in some classification systems; Pteridaceae is itself in turn sometimes subdivided into the families Actiniopteridaceae; Adiantaceae; Cryptogrammataceae; includes genera Acrostichum; Adiantopsis; Adiantum; Anogramma; Bommeria; Cheilanthes; Coniogramme; Doryopteris; Gymnopteris; Hemionitis; Jamesonia; Paraceterach; Pellaea; Pityrogramma; Pteris; Ptilopteris |