Killarney fern  (Trichomanes speciosum)

This fern is found mainly in Ireland, Brittany (north-western France), the Canaries, Madeira and the Azores. In Britain it is found in two stages, one of which is rare and found from a few sites in the west of the country. The other, more numerous stage, is widely scattered, but more common in the west.

Killarney fern requires a humid, frost-free environment, and in Britain, is restricted to shady, sheltered ravines with waterfalls, or places with similar conditions.