Synonyms for King Fern (same or very similar meaning)
WordNet sense 1 (fern of rain forests of tropical Australia and New Zealand and South Africa):
crepe fern, Todea barbaraWordNet sense 2 (large deeply rooted fern of worldwide distribution with upright bipinnate compound tufted fronds):
royal fern, ditch fern, French bracken, Osmunda regalis, royal osmundFrom the ODE community, based on WordNetadd/edit