alpine lady-fern
athyrium distentifolium latin

Athyrium flexile is a stunted variety of Alpine Lady-fern A. distentifolium, a single gene mutation accounting for the difference between the two.

It is considered by some experts to be a variant of Alpine Lady-fern (Athyrium distentifolium var flexile) rather than a distinct species.

Wilsons Filmy-fern is a common upland variety in the Highlands, along with the Tunbridge Filmy-fern, Alpine Lady-fern and the rarer stunted form Newman's Lady-fern (A. distentifolium var.

It is considered by some experts to be a variant of Alpine Lady-fern (Athyrium distentifolium var flexile) rather than a distinct species.