Ptychostomum warneum, known as sea bryum or Warne's threadmoss, is a protected moss found in sandy coastal areas in temperate regions of Europe (including Iceland) and is also recorded to have been found in the Himalaya, the Altai Mountains and in Quebec, Canada.
It is a pioneer species intolerant of both shade and trampling.
Generally forming dense clusters of plants with one-centimetre stems with small, hanging capsules in which are produced and, upon maturity, emitted.
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