Synonyms for Silvery Spleenwort (same or very similar meaning)
WordNet sense 1 (fern with elongate silvery outgrowths enclosing the developing spores):
Athyrium thelypteroides, Deparia acrostichoidesWordNet sense 2 (North American fern with narrow fronds on yellowish leafstalks):
Athyrium pycnocarpon, Diplazium pycnocarpon, glade fern, narrow-leaved spleenwortFrom the ODE community, based on WordNetadd/edit