Athyrium distentifolium

Athyrium distentifolium

Athyrium distentifolium commonly known as Alpine Lady-fern is a fern found in widely in the Northern Hemisphere.

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.

The sub-species americanum is found in the western United States, Alaska, Canada and coastal Greenland.

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