Synonyms for Potato Fern (same or very similar meaning)
WordNet sense 1 (large Australasian evergreen fern with an edible rhizome sometimes used as a vegetable by indigenous people):
Marattia salicinaWordNet sense 2 (small epiphytic fern of South America with tuberous swellings along rhizomes):
Solanopteris bifronsFrom the ODE community, based on WordNetadd/edit