adder's-tongue fernadder's-tongue fern
Any of various ferns in the genus Ophioglossum, having an erect stem that branches into a single oval blade and a spikelike spore-bearing stalk. Also called adder's-tongue .
Origin of adder's-tongue fernFrom the resemblance of the spike at the base of the frond to a snake's tongue
southern adder's-tongue fern