Cystopteridaceae

English: Oak ferns.
Clades: Aspleniales; Aspleniineae; Polypodianae; Pteridophyta; Plants.
Region: worldwide.
Habitat: forests and crevices.Plant theoryIn the Plant theory the small families Desmophlebiaceae, Diplaziopsidaceae, Hemidictyaceae, and Rhachidosoraceae are included Cystopteridaceae. This clade is polyphyletic without Aspleniaceae, according to DNA analyses.
They are placed in Subphase 6, which has some confirmation.TaxonomyThe Pteridophyte Phylogeny Group classification of 2016 placed Cystopteridaceae in the subclass Aspleniineae. Alternatively, it may be treated as the subfamily Cystopteridoideae of a very broadly defined family Aspleniaceae.
Cystopteridaceae forms a closely related, but not monophyletic group with Desmophlebiaceae, Diplaziopsidaceae, Hemidictyaceae, and Rhachidosoraceae. Cystopteris chinensis has been placed in a separate genus;, which is in doubt.BotanyFern, small or medium-sized ferns.
Leaves: thin laminae; small, round.
Sori: naked.MembersCystopteridaceae: Acystopteris, Cystoathyrium, Cystopteris, Gymnocarpium; 37 species.Desmophlebiaceae: 1 genus, Desmophlebium; 2 species.Diplaziopsidaceae: Diplaziopsis, Homalosorus; 4 species.
Region: east Asia, China, New Guinea, Pacific.
Habitat: near streams; forested areas.
Ferns: medium to large.
Root: rhizomes are thick and decumbent to erect.HemidictyaceaeName: derived from the terms hemi (half) and diktyon (net).
Members: 1 genus, Hemidictyum; 1 species.RhachidosoraceaeMembers: 1 genus, Rhachidosorus; 8 species.Stages Remedies1 Rhachidosorus consimilis
10 Gymnocarpium dryopteris
10 Gymnocarpium robertianum
13 Cystopteris tennesseensis
16 Cystopteris bulbifera
17 Acystopteris japonica
2 Diplaziopsis flavoviridis
5 Hemidictyum marginatum
x Cystopteris fragilis
x Homalosorus pycnocarpos