Quick definitions from WordNet (hart's-tongue fern)
▸ noun: Eurasian fern with simple lanceolate fronds
▸ noun: tropical American terrestrial fern with leathery lanceolate fronds; sometimes placed in genus Polybotrya
▸ noun: common epiphytic or sometimes terrestrial fern having pale yellow-green strap-shaped leaves; Florida to West Indies and Mexico and south to Uruguay
▸ noun: Eurasian fern with simple lanceolate fronds
▸ noun: tropical American terrestrial fern with leathery lanceolate fronds; sometimes placed in genus Polybotrya
▸ noun: common epiphytic or sometimes terrestrial fern having pale yellow-green strap-shaped leaves; Florida to West Indies and Mexico and south to Uruguay