English: Mountain wood fern.
Region: American.
Habitat: higher elevations and latitudes.
BotanyFern; large; bottom innermost pinnule on the basal pinnae spans approximately the first two top innermost pinnules on the same pinnae.
Synonym: Dryopteris spinulosa var. americana.
TaxonomyThis fern is a tetraploid species of hybrid origin, the parents being Dryopteris intermedia and
Dryopteris expansa. Phenotypologically, the fern greatly resembles the second parent.