1. (noun) hart's-tongue, hart's-tongue fern, Olfersia cervina, Polybotrya cervina, Polybotria cervina
tropical American terrestrial fern with leathery lanceolate fronds; sometimes placed in genus Polybotrya
2. (noun) hart's-tongue, hart's-tongue fern, Asplenium scolopendrium, Phyllitis scolopendrium
Eurasian fern with simple lanceolate fronds
3. (noun) Florida strap fern, cow-tongue fern, hart's-tongue fern
common epiphytic or sometimes terrestrial fern having pale yellow-green strap-shaped leaves; Florida to West Indies and Mexico and south to Uruguay
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Definitions of hart's-tongue fern 
