Synonyms for Filmy Fern (same or very similar meaning)
WordNet sense 1 (any fern of the genus Trichomanes having large pinnatifid often translucent fronds; most are epiphytic on tree branches and twigs or terrestrial on mossy banks):
bristle fernWordNet sense 2 (any fern of the genus Hymenophyllum growing in tropical humid regions and having translucent leaves):
film fernFrom the ODE community, based on WordNetadd/edit