cystopteris definition

  • noun:
    • A genus of delicate flaccid polypodi-aceous ferns getting the sori borne in the straight back of this leaf on the middle of a vein and covered with a membranaceous indusium affixed only because of the base; the bladder-ferns.
    • mainly small perennial stone ferns: bladder ferns; in a few classifications positioned in Polypodiaceae
    • A genus of delicate flaccid polypodi-aceous ferns getting the sori borne on the straight back for the leaf in the center of a vein and covered with a membranaceous indusium affixed only because of the base; the bladder-ferns.
    • chiefly small perennial stone ferns: bladder ferns; in certain classifications put in Polypodiaceae

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