Warne's thread-moss Bryum warneum

Status Amber - Vulnerable and Near-Threatened
Best Time to See January, February, March, April, May, June, July, August, September, October, November, December
Habitat Coastal

Also known as 'sea bryum'.

Warne's thread-moss is acrocarpous - meaning it bears fruit on the end of its stems. These grow in dense patches and up to a centimetre in height.

It can only be identified when fruiting bodies are present.


Usually grows in moist hollows in sand dunes.


It is classified as Vulnerable in Britain.

Did you know?

  • It's been found on shores as far north as Iceland.
  • Despite the name of "Sea Bryum" its also been found up the Himalayan Mountains.

Key threats

Survey work is currently underway to confirm its current status in Britain and also to identify any threats to sites. The main threats are likely to be falling water tables and nutrient enrichment in dune systems, dunes becoming overgrown and recreational development, including nutrient enrichment from dog fouling.

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