/ Thesaurus / P Synonyms of pellaea rotundifolia Find synonyms for: Noun1. button fern, Pellaea rotundifolia, fernusage: fern of New Zealand and Australia having trailing fronds with dark green buttonlike leafletsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: bibliophile Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language