Tausch ex Opiz
It is a common upland variety above 600 metres in the Highlands of Scotland, with more than 10% of the UK population being found in the Cairngorm mountains, especially on scree slopes in Glen Feshie, and on Ben Avon, Ben MacDui and Beinn a' Bhùird. Regarded as nationally scarce, it is a snow-tolerant species. The stunted form var. flexile, which is found at 750 metres and above, is found at only 4 sites and is endemic to Scotland.
- Ratcliffe, Derek (1977) Highland Flora. Inverness. HIDB. pp. 67 and 82.
- Shaw, Philip and Thompson, Des (eds.) (2006) The Nature of the Cairngorms: Diversity in a changing environment. Edinburgh. The Stationery Office. ISBN 0-11-497326-1. pp. 75 and 218-35.
- "Species Action Plan: Newman's Lady Fern (Athyrium flexile)" Archived October 31, 2007, at the Wayback Machine BAP. Retrieved 29 June 2008.
- "Plants Profile: Athyrium americanum" USDA Retrieved 24 June 2008.