''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
''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 ...
'' form a natural but relatively primitive clade that is basal to the
asplenioid,
thelypterioid, and athyrioid ferns comprehensively.
''Gymnocarpium''
sori are small, round and naked. These ferns generally have a slender, creeping rhizome under the surface of the ground, and fairly thin-textured fronds.
''Gymnocarpium'' species
*''
Gymnocarpium appalachianum'' – Appalachian oak fern
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Gymnocarpium brittonianum''
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Gymnocarpium dryopteris
''Gymnocarpium dryopteris'', the western oakfern, common oak fern , oak fern, or northern oak fern, is a deciduous fern of the family Cystopteridaceae. It is widespread across much of North America and Eurasia. It has been found in Canada, the ...
'' – (northern) oak fern
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Gymnocarpium fedtschenkoanum''
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Gymnocarpium disjunctum''
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Gymnocarpium jessoense'' – western or Nahanni oak fern
*''
Gymnocarpium oyamense''
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Gymnocarpium remotepinnatum''
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Gymnocarpium robertianum'' – limestone oak fern
External links
''Gymnocarpium'' world species list
Fern genera
Taxa named by Edward Newman
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