silvery spleenwort

(noun) fern with elongate silvery outgrowths enclosing the developing spores. Synonyms: silvery spleenwort, Deparia acrostichoides, Athyrium thelypteroides.

(noun) North American fern with narrow fronds on yellowish leafstalks. Synonyms: silvery spleenwort, glade fern, narrow-leaved spleenwort, Athyrium pycnocarpon, Diplazium pycnocarpon.