Asplenium anceps

Asplenium anceps is a diploid fern of family Aspleniaceae and one of the ancestors of the ferns that form the trichomanes complex. It lives exclusively in the three northernmost archipelagoes of the Macaronesian region, that is, is an endemic macaronesian fern. Its fronds are leathery and plastic and rachis is very thick, bright reddish brown and is traversed throughout its length of three wings, two on the upper surface to draw a groove and a third on the lower surface which is characteristic and unique to this species, since all other species of the trichomanes complex without. A typical feature of this fern, which he shares with all its hybrid offspring (Asplenium azoricum, Asplenium azomanes and Asplenium X tubalense) is the existence of a small atrium on the basis of medium and less pinnae directed toward the apex of the blade with one or two sori on its underside....read more on Wikipedia.