filmy fern
fil·my·fern
noun
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
2.
any fern of the genus Hymenophyllum growing in tropical humid regions and having translucent leaves
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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.