Ophioglossum azoricum, the small adder's-tongue fern or lesser adder's-tongue fern, is a small fern of the family Ophioglossaceae.

Ophioglossaceae, from Ancient Greek ὄφις, meaning "snake", and γλῶσσα, meaning "tongue", also known as the adder's-tongue family, is a small family of ferns. In the Pteridophyte Phylogeny Group classi