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Family: Aspleniaceae
Family: Dennstaedtiaceae
Family: Dryopteridaceae
  Genus: Athyrium

    Athyrium filix-femina (L.) Roth ex Mert.
        common lady fern, lady fern
    Athyrium filix-femina (L.) Roth ex Mert. var. angustum (Willd.) G.Lawson*+
        common lady fern, lady fern, northeastern lady fern, northern lady fern
             Aspidium angustum Willd.
             Asplenium elatius Link
             Athyrium angustum (Willd.) C.Presl
             Athyrium angustum (Willd.) C.Presl var. elatius (Link) Butters
             Athyrium angustum (Willd.) C.Presl var. rubellum (Gilbert) Butters
             Athyrium angustum (Willd.) C.Presl var. subtripinnatum Butters
             Athyrium filix-femina (L.) Roth ex Mert. subsp. angustum
             Athyrium filix-femina (L.) Roth ex Mert. var. michauxii (Spreng.) Farw.
             Athyrium filix-femina (L.) Roth ex Mert. f. elatius (Link) Clute var. michauxii (Spreng.) Farw.
             Athyrium filix-femina (L.) Roth ex Mert. f. rubellum (Gilbert) Farw. var. michauxii (Spreng.) Farw.
             Athyrium filix-femina (L.) Roth ex Mert. var. rubellum Gilbert
  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
  Genus: Deparia

    Deparia acrostichoides (Sw.) M.Kato*+
        silver false spleenwort, silvery glade fern, silvery spleenwort
             Asplenium acrostichoides Sw.
             Athyrium acrostichoides (Sw.) Diels
             Athyrium thelypterioides (Michx.) Desv.
             Athyrium thelypterioides (Michx.) Desv. f. acrostichoides (Sw.) Gilbert
             Diplazium acrostichoides (Sw.) Butters
  Genus: Diplazium

    Diplazium pycnocarpon (Spreng.) M.Broun*+
        glade fern, narrow-leaved glade fern, narrow-leaved spleenwort
             Asplenium angustifolium Michx.
             Asplenium pycnocarpon Spreng.
             Homalosorus pycnocarpos (Spreng.) Pic.Serm.
             Athyrium angustifolium (Michx.) Milde
             Athyrium pycnocarpon (Spreng.) Tidestr.
  Genus: Dryopteris

    Dryopteris carthusiana (Vill.) H.P.Fuchs*+
        spinulose wood fern, toothed wood fern
             Aspidium spinulosum (O.F.Müll.) Sw.
             Dryopteris austriaca (Jacq.) Woyn. var. spinulosa (O.F.Müll) Fiori
             Dryopteris spinulosa (O.F.Müll.) Watt
             Polypodium carthusianum Vill.
             Polypodium spinulosum O.F.Müll.
             Thelypteris spinulosa (O.F.Müll.) Nieuwl.
    Dryopteris clintoniana (D.C.Eaton) Dowell+
        Clinton's shield fern, Clinton's wood fern
             Aspidium cristatum (L.) Sw. var. clintonianum D.C.Eaton
             Dryopteris cristata (L.) A.Gray var. clintoniana (D.C.Eaton) Underw.
             Dryopteris X poyseri Wherry X
             Thelypteris cristata (L.) Nieuwl. var. clintoniana (D.C.Eaton) Weath.
    Dryopteris cristata (L.) A.Gray*+
        crested shield fern, crested wood fern
             Aspidium cristatum (L.) Sw.
             Polypodium cristatum L.
             Thelypteris cristata (L.) Nieuwl.
    Dryopteris expansa (C.Presl) Fraser-Jenk. & Jermy*+
        northern wood fern, spreading wood fern
             Nephrodium expansum C.Presl
             Aspidium spinulosum (O.F.Müll.) Sw. var. americanum Fisch. ex Kunze
             Dryopteris assimilis S.Walker
             Dryopteris dilatata auct. non (Hoffm.) A.Gray
             Dryopteris dilatata (Hoffm.) A.Gray subsp. americana
             Dryopteris spinulosa (O.F.Müll.) Watt var. americana (Fisch. ex Kunze) Fernald
             Dryopteris spinulosa (O.F.Müll.) Watt var. dilatata auct. non (Hoffm.) Underw.
             Thelypteris spinulosa (O.F.Müll.) Nieuwl. var. americana (Fisch. ex Kunze) Weath.
    Dryopteris filix-mas (L.) Schott*+
        male fern
             Polypodium filix-mas L.
    Dryopteris fragrans (L.) Schott*+
        fragrant fern, fragrant wood fern
             Dryopteris fragrans (L.) Schott var. remotiuscula Kom.
             Thelypteris fragrans (L.) Nieuwl.
             Thelypteris fragrans (L.) Nieuwl. var. hookeriana Fernald
             Polypodium fragrans L.
    Dryopteris goldiana (Hook. ex Goldie) A.Gray*+
        giant wood fern, Goldie's fern, Goldie's wood fern
             Aspidium goldianum Hook. ex Goldie
             Thelypteris goldiana (Hook. ex Goldie) Nieuwl.
    Dryopteris intermedia (Muhl. ex Willd.) A.Gray*+
        fancy wood fern, glandular wood fern, intermediate wood fern
             Aspidium intermedium Muhl. ex Willd.
             Aspidium spinulosum (O.F.Müll.) Sw. var. intermedium (Muhl. ex Willd.) D.C.Eaton
             Dryopteris austriaca (Jacq.) Woyn. var. intermedia (Muhl. ex Willd.) C.V.Morton
             Dryopteris spinulosa (O.F.Müll.) Watt var. intermedia (Muhl. ex Willd.) Underw.
             Thelypteris spinulosa (O.F.Müll.) Nieuwl. var. intermedia (Muhl. ex Willd.) Nieuwl.
    Dryopteris intermedia (Muhl. ex Willd.) A.Gray X D. marginalis (L.) A.Gray+
        glandular marginal wood fern
    Dryopteris marginalis (L.) A.Gray*+
        marginal shield fern, marginal wood fern
             Aspidium marginale (L.) Sw.
             Polypodium marginale L.
             Thelypteris marginalis (L.) Nieuwl.
    Dryopteris X boottii (Tuck.) Underw. (pro sp.) X *+
        Boott's wood fern
             Aspidium boottii Tuck.
             Thelypteris boottii (Tuck.) Nieuwl.
    Dryopteris X pittsfordensis Sloss. X +
        Pittsford's wood fern
    Dryopteris X slossonae Wherry ex Lellinger X +
        Slosson's wood fern
    Dryopteris X triploidea Wherry X +
        triploid wood fern
             Dryopteris austriaca (Jacq.) Woyn. var. fructuosa (Gilbert) C.V.Morton
             Dryopteris intermedia (Muhl. ex Willd.) A.Gray var. fructuosa (Gilbert) Wherry
             Dryopteris spinulosa (O.F.Müll.) Watt var. fructuosa (Gilbert) Trudell
             Thelypteris spinulosa (O.F.Müll.) Nieuwl. var. fructuosa (Gilbert) Fernald
    Dryopteris X uliginosa (A.Braun ex Dowell) Druce X +
        spinulose crested wood fern
             Dryopteris cristata (L.) A.Gray X D. spinulosa (O.F.Müll.) Watt
  Genus: Gymnocarpium

    Gymnocarpium dryopteris (L.) Newman*+
        common oak fern, western oak fern
             Dryopteris disjuncta (Rupr.) C.V.Morton
             Dryopteris dryopteris (L.) Britton
             Dryopteris linnaeana C.Chr.
             Lastrea dryopteris (L.) Bory
             Polypodium dryopteris L.
             Phegopteris dryopteris (L.) Fée
             Thelypteris dryopteris (L.) Sloss.
    Gymnocarpium jessoense (Koidz.) Koidz.
        Asian oak fern, northern oak fern
    Gymnocarpium jessoense (Koidz.) Koidz. subsp. parvulum*+
        Asian oak fern, Nahanni oak fern, northern oak fern
    Gymnocarpium robertianum (Hoffm.) Newman*+
        limestone oak fern, scented oak fern
             Dryopteris robertiana (Hoffm.) C.Chr.
             Gymnocarpium dryopteris (L.) Newman var. pumilum (DC.) B.Boivin
             Polypodium robertianum Hoffm.
             Phegopteris robertiana (Hoffm.) Fée
             Thelypteris robertiana (Hoffm.) Sloss.
    Gymnocarpium X brittonianum (Sarvela) K.M.Pryer & Haufler X
        oak fern
    Gymnocarpium X heterosporum W.H.Wagner X
        black-spore oak fern
    Gymnocarpium X intermedium Sarvela X +
        intermediate oak fern
             Dryopteris linnaeana C.Chr. f. glandulosa R.M.Tryon
  Genus: Matteuccia

    Matteuccia struthiopteris (L.) Todaro
        ostrich fern
    Matteuccia struthiopteris (L.) Todaro var. pensylvanica (Willd.) C.V.Morton*+
        American ostrich fern, ostrich fern
             Matteuccia pensylvanica (Willd.) Raymond
             Matteuccia struthiopteris (L.) Todaro var. pubescens (Terry) Clute
             Onoclea struthiopteris (L.) Hoffm. var. pensylvanica (Willd.) B.Boivin
             Pteretis nodulosa (Michx.) Nieuwl.
             Pteretis nodulosa (Michx.) Nieuwl. f. pubescens (Terry) Fernald
             Pteretis pensylvanica (Willd.) Fernald
             Pteretis pensylvanica (Willd.) Fernald f. pubescens (Terry) Fernald
             Pteretis struthiopteris (L.) Nieuwl.
             Struthiopteris pensylvanica Willd.
  Genus: Onoclea

    Onoclea sensibilis L.*+
        sensitive fern
             Onoclea sensibilis L. f. obtusilobata (Schkuhr) Gilbert
             Onoclea sensibilis L. var. obtusilobata (Schkuhr) Torr.
  Genus: Polystichum

    Polystichum acrostichoides (Michx.) Schott*+
        Christmas fern
             Nephrodium acrostichoides Michx.
             Polystichum acrostichoides (Michx.) Schott var. acrostichoides
             Polystichum acrostichoides (Michx.) Schott var. schweinitzii (Beck) Small
    Polystichum braunii (Spenn.) Fée*+
        Braun's holly fern
             Aspidium braunii Spenn.
             Polystichum braunii (Spenn.) Fée subsp. purshii
             Polystichum braunii (Spenn.) Fée var. purshii Fernald
    Polystichum lonchitis (L.) Roth*
        northern holly fern
             Polypodium lonchitis L.
  Genus: Woodsia

    Woodsia ilvensis (L.) R.Br.*+
        rusty cliff fern, rusty woodsia
             Acrostichum ilvense L.
    Woodsia obtusa (Spreng.) Torr.
        blunt-lobe cliff fern, blunt-lobed woodsia
    Woodsia obtusa (Spreng.) Torr. subsp. obtusa*+
        blunt-lobe cliff fern, blunt-lobed woodsia
             Polypodium obtusum Spreng.
    Woodsia oregana D.C.Eaton
        Oregon cliff fern, Oregon woodsia, western cliff fern
    Woodsia oregana D.C.Eaton subsp. cathcartiana*+
        Cathcart's cliff fern, Oregon cliff fern, Oregon woodsia, western cliff fern
             Woodsia cathcartiana B.L.Rob.
             Woodsia oregana D.C.Eaton f. cathcartiana (B.L.Rob.) B.Boivin
             Woodsia oregana D.C.Eaton f. glandulosa T.M.C.Taylor
             Woodsia oregana D.C.Eaton var. cathcartiana (B.L.Rob.) C.V.Morton
             Woodsia pusilla E.Fourn. var. cathcartiana (B.L.Rob.) T.M.C.Taylor
    Woodsia scopulina D.C.Eaton
        mountain cliff fern, Rocky Mountain woodsia
    Woodsia X abbeae Butters X *+
             Woodsia confusa T.M.C.Taylor
             Woodsia oregana D.C.Eaton var. squammosa B.Boivin
Family: Osmundaceae
Family: Polypodiaceae
Family: Pteridaceae
Family: Thelypteridaceae
  Genus: Phegopteris

    Phegopteris connectilis (Michx.) Watt*+
        Narrow beech fern, northern beech fern
             Dryopteris phegopteris (L.) C.Chr.
             Polypodium connectile Michx.
             Polypodium phegopteris L.
             Phegopteris polypodioides Fée
             Thelypteris phegopteris (L.) Sloss.
    Phegopteris hexagonoptera (Michx.) Fée*+
        broad beech fern, southern beech fern
             Dryopteris hexagonoptera (Michx.) C.Chr.
             Polypodium hexagonopterum Michx.
             Thelypteris hexagonoptera (Michx.) Nieuwl.
  Genus: Thelypteris

    Thelypteris palustris Schott var. pubescens (Lawson) Fernald*+
        eastern marsh fern, marsh fern
             Dryopteris thelypteris auct. non (L.) Sw.
             Dryopteris thelypteris (L.) A.Gray var. haleana (Fernald) M.Broun & Weath.
             Dryopteris thelypteris (L.) A.Gray var. pubescens (G.Lawson) Weath.
             Lastrea thelypteris (L.) Bory var. pubescens Lawson
             Thelypteris confluens (Thunb.) C.V.Morton var. pubescens (Lawson) Pringle
             Thelypteris palustris Schott var. haleana Fernald
    Thelypteris simulata (Davenp.) Nieuwl.*+
        bog fern, Massachusetts fern
             Aspidium simulatum Davenp.
             Dryopteris simulata Davenp.
             Parathelypteris simulata (Davenp.) Holttum

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