Cystopteridaceae is a family of
ferns in the order
Polypodiales. In the
Pteridophyte Phylogeny Group classification of 2016 (PPG I), the family is placed in the suborder
Aspleniineae of the order
Polypodiales, and includes three genera.
[ Alternatively, it may be treated as the subfamily Cystopteridoideae of a very broadly defined family Aspleniaceae.][
Cystopteridaceae are small or medium-sized ferns in forests and crevices.][ They generally have thin laminae, and small, round, naked sori.
]
Genera
Three genera are accepted in the PPG I classification, and by the ''Checklist of Ferns and Lycophytes of the World'' . One hybrid genus also exists:[
*'' Acystopteris'' Nakai
*'']Cystopteris
''Cystopteris'' is a genus of ferns in the family Cystopteridaceae. These are known generally as bladderferns or fragile ferns. They grow in temperate areas worldwide. This is a very diverse genus and within a species individuals can look quite ...
'' Bernh.
*''Gymnocarpium
''Gymnocarpium'' is a small genus of ferns, called oak ferns. It was once placed with various other groups, including the dryopteroid ferns and the athyrioid ferns. Cladistic analysis has demonstrated that ''Gymnocarpium'' and ''Cystopteris'' ...
'' Newman
*'' ×Cystocarpium'' Fraser-Jenk.
'' Cystopteris chinensis'' has been placed in a separate genus, ''Cystoathyrium'', but the genus is not accepted by recent sources.[
]
Phylogenetic relationships
''Gymnocarpium'' and ''Cystopteris'' have been found to be sister to the remaining Aspleniineae.[
]
References
Polypodiales
Fern families
{{Polypodiales-stub