'filmy fern' definitions:

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 [syn: bristle fern, filmy fern]

Any fern of the genus Hymenophyllum growing in tropical humid regions and having translucent leaves [syn: filmy fern, film fern]