Source : WordNet®

filmy fern
     n 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 [syn: {bristle
          fern}]
     2: any fern of the genus Hymenophyllum growing in tropical
        humid regions and having translucent leaves [syn: {film
        fern}]