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Family: Dennstaedtiaceae
Family: Dryopteridaceae
  Genus: Cystopteris

    Cystopteris bulbifera (L.) Bernh.*+
        bladder fern, bulblet bladder fern, bulblet fragile fern
             Filix bulbifera (L.) Underw.
             Polypodium bulbiferum L.
    Cystopteris fragilis (L.) Bernh.*+
        bladder fern, brittle bladder fern, northern fragile fern
             Cystopteris dickieana Sim
             Cystopteris fragilis (L.) Bernh. subsp. dickieana
             Cystopteris fragilis (L.) Bernh. var. angustata Lawson
             Cystopteris fragilis (L.) Bernh. var. fragilis
             Cystopteris fragilis (L.) Bernh. var. woodsioides H.Christ
             Filix fragilis (L.) Gilib.
             Polypodium fragile L.
    Cystopteris laurentiana (Weath.) Blasdell*+
        Laurentian bladder fern, St. Lawrence bladder fern
             Cystopteris fragilis (L.) Bernh. var. huteri (Hausm.) Luerss.
             Cystopteris fragilis (L.) Bernh. var. laurentiana Weath.
             Cystopteris X laurentiana (Weath.) Blasdell X
    Cystopteris protrusa (Weath.) Blasdell+
        creeping fragile fern, lowland bladder fern
             Cystopteris fragilis (L.) Bernh. var. protrusa Weath.
    Cystopteris tennesseensis Shaver+
        Tennessee bladder fern
             Cystopteris fragilis (L.) Bernh. f. simulans Weath.
             Cystopteris fragilis (L.) Bernh. var. simulans (Weath.) McGregor
             Cystopteris fragilis (L.) Bernh. var. tennesseensis (Shaver) McGregor
             Cystopteris X tennesseensis Shaver X
    Cystopteris tenuis (Michx.) Desv.*+
        MacKay's brittle fern, upland brittle bladder fern
             Nephrodium tenue Michx.
             Cystopteris fragilis (L.) Bernh. var. mackayi G.Lawson
    Cystopteris X illinoensis R.C.Moran X +
        Illinois bladder fern
Family: Polypodiaceae

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