The Collaborative International Dictionary
                    Hart's-tongue
                    
                        
                
                                                                    Hart's-tongue \Hart's"-tongue`\ (h[aum]rts"t[u^]ng`), n. (Bot.)
- A common British fern ( Scolopendrium vulgare), rare in America. 
- A West Indian fern, the Polypodium Phyllitidis of Linn[ae]us. It is also found in Florida. 
WordNet
                    hart's-tongue
                    
                        
                
                                                                    - n. tropical American terrestrial fern with leathery lanceolate fronds; sometimes placed in genus Polybotrya [syn: hart's-tongue fern, Olfersia cervina, Polybotrya cervina, Polybotria cervina] 
- Eurasian fern with simple lanceolate fronds [syn: hart's-tongue fern, Asplenium scolopendrium, Phyllitis scolopendrium] 
Usage examples of "hart's-tongue".
Hart's-tongue fern grew above it, and there was moss at the lip, and below it green, moist grass.