Mountain woodfern is endangered in Connecticut. These photos were taken in New Hampshire and Canada, where the fern is more common.
- Synonyms: Dryopteris spinulosa var. americana (Fisch. ex Kunze) Fernald
- Family: woodfern (Dryopteridaceae)
- Habitat: cool, moist woods, usually in acidic soil
- Height: fronds 2-3 feet long
- Location of spores: underside of fronds
- Petiole (leaf stalk): green, with light-brown scales at the base
- Growth pattern: asymmetric clump
- Persistence: deciduous
- Origin: native
Underside of a frond, showing the small, round sori (spore-bearing dots) near the tips of veins.