Gymnocarpium

The oak ferns
Scientific classification
Kingdom:	Plantae
Division:	Pteridophyta
Class:	Pteridopsida
Order:	Polypodiales
(unranked):	Eupolypods II
Family:	Cystopteridaceae
Genus:	Gymnocarpium Newm. 1851
Species:	See text

Gymnocarpium is a small genus of ferns once placed with various other groups, including the dryopteroid ferns and the athyrioid ferns. Cladistic analysis has demonstrated that Gymnocarpium and Cystopteris form a natural but relatively primitive clade that is basal to the asplenoid, 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
• Gymnocarpium brittonianum
• Gymnocarpium dryopteris -- oak fern, Eichenfarn
• Gymnocarpium fedtschenkoanum
• Gymnocarpium disjunctum
• Gymnocarpium jessoense -- western or Nahanni oak fern
• Gymnocarpium oyamense
• Gymnocarpium remotepinnatum
• Gymnocarpium robertianum -- limestone oak fern, Ruprechtsfarn

External links

• Gymnocarpium world species list