English name: Northern Buckler-fern
Gaelic name: Raineach nan Radan Thuathch

Synonym: Dryopteris assimilis

Atlas of Ferns:
Post 1950 records: NG25, 53.

British Pteridophyte Records:
BPS Bulletin Volume 2, Number 1, (1979): NG54 C. W. Murray.

Botanist in Skye: NG25, 53.

New Atlas:
1970-1986: NG25.
1987-1999: NG71.

Dryopteris expansa is one of the rarest ferns on Skye. In the "Botanist in Skye" it states that it was found on the wall of Dun Fiadhairt near Dunvegan.