Marsupella arctica, commonly known as Arctic rustwort,[3] is a species of liverwort found in the Northern Hemisphere.

It is present in Alaska and Greenland[4] and has a European distribution confined to Scotland and Svalbard.

The Scottish population was first discovered in 1989 and is restricted to two sites in the Cairngorm mountains - the Lairig Ghru and Beinn a' Bhùird.

[5] The species occupies montane and alpine habitats,[1] and in Britain is classified as a "Vulnerable".

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