A genus of dryopteroid polypodiaceous ferns well-marked by their erect habit, dryish texture, and chaffy vascular parts, and also by getting the ultimate divisions for the frond primarily auriculate and spinulose. It is distinguished from Dryopteris by its centrally peltate indusia. There are about 75 species, mainly boreal in distribution, quite a few well known. See holly-fern, Christmas fern (under Christmas time), and Aspidium, 1.
little to medium-sized terrestrial ferns specially holly ferns; in certain classification systems put in Polypodiaceae