Quick definitions from WordNet (silvery spleenwort)
▸ noun: North American fern with narrow fronds on yellowish leafstalks
▸ noun: fern with elongate silvery outgrowths enclosing the developing spores
▸ noun: North American fern with narrow fronds on yellowish leafstalks
▸ noun: fern with elongate silvery outgrowths enclosing the developing spores