Genus: Polystichum — holly fern
Plants in the fern genus Polystichum have a lobe on the upper side of the base of the finest leaf division. The sori are attached to the leaf by a central stalk, covering the spores like an umbrella. Reference: Wagner (1993).
Dryopteridaceae (wood fern family)
This genus’s species in New England
Visit this genus in the Dichotomous Key