The 9 rare native British and Irish species are restricted to very few sites and in some cases to very few individuals

Anogramma leptophylla (L.) LinkJersey FernAdiantaceae
Asplenium onopteris L.Western SpleenwortAspleniaceae
Cystopteris diaphana (Bory) BlasdellWintergreen Bladder FernWoodsiaceae
C. dickeana SimDickie’s Bladder Fern
C. montana (Lam.) Desv.Mountain Bladder Fern
Ophioglossum azoricum C. Presl.Small Adder's TongueOphioglossaceae
O. lusitanicum L.Least Adder's Tongue
Trichomanes speciosum Willd.Killarney FernHymenophyllaceae
Woodsia alpina (Bolton) S.F.GrayAlpine WoodsiaWoodsiaceae
W. ilvensis (L.) R.Br.Oblong Woodsia

The 6 scarce native species are absent from most of Britain and Ireland, and confined to a limited habitat range, but may be locally common within their restricted distribution

Adiantum capillus-veneris L.Maidenhair FernAdiantaceae
Asplenium obovatum Viv. subspecies lanceolatum (Huds.) P.Silva (= A. billotii)Lanceolate SpleenwortAspleniaceae
Athyrium distentifolium TauschAlpine Lady FernWoodsiaceae
Dryopteris cristata (L.) A.GrayFen Buckler FernDryopteridaceae
D. submontana (Fras.-Jenkins & Jermy) Fras.-JenkinsRigid Buckler Fern
Pteridium pinetorum C.N.Page & R.R.Mill.Northern BrackenDennstaedtiaceae
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