| filmy fern | (n) any fern of the genus Hymenophyllum growing in tropical humid regions and having translucent leaves, Syn. film fern |
| bristle fern | (n) 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. filmy fern |