Adder's-tongue Fern is an unusual fern that grows in old grasslands, on hillsides, along woodland rides and on sand dunes. It usually appears between June and August, spending the rest of the year underground as a rhizome. It is considered a good indicator species of ancient meadows. There used to be more plants around the pond area but they are hard to protect from mowing as they are not obvious. They could easily be more common than generally realised as they are so easily missed.