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Aspen Bristle-moss

Nyholmiella gymnostoma

Close up of the detailed Aspen Bristle-moss growing on Aspen tree bark

As the name suggests, Aspen Bristle-moss is an Aspen Populus tremula specialist, it grows exclusively on Aspen tree bark. While you may see Aspen trees occasionally across the country, Aspen dominated woodland with a range of young and older trees is very rare. These sites provide a home for this and other rare species of epiphyte (species which grow on the surface of other plants).

Where it grows

Aspen Bristle-moss is only known to grow at three sites in the entire UK. All three sites are in and around the Cairngorms in Scotland.

Close up image of the beautiful bright green Aspen Bristle-moss growing out of grey coloured tree bark

Best Time to See it

Aspen Bristle-moss can be spotted all throughout the year. Though given that it only grows at three sites, it is a particularly tricky one to find.

Mosses and liches which grow as epiphytes are often easiest to spot in winter months as they remain green all year round, are often fresher and brighter when wet, and are not obscured by summer vegetation. 

Something You Might Not Know

This beautiful, tiny moss was believed to be extinct in the UK in 2000, but a lucky find in 2003 sparked a drive to hunt for it again. It was quickly discovered at three new sites, but no further patches have been found since.

A new Plantlife project looking at this and other species of rare Aspen epiphyte will investigate whether these often overlooked species are truly as rare as they seem, or just under-recorded.

Photos taken by Gus Routledge

Other Species