Acaulon mediterraneum

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Identification notes

A. mediterraneum looks just like A. muticum, and is tiny, bud-like and cleistocarpous. It will not be found in passing – either a dedicated search of barish, disturbed ground is needed, or it will be collected accidentally as a ‘bonus bryophyte’ with something else.

The only way to distinguish A. mediterraneum from A. muticum, which is a more common species (though never that common!) is to examine ripe spores under a compound microscope. The spiny spore coat of A. mediterraneum is strikingly different to the slightly granulose spores of A. muticum.

Distribution in Great Britain and Ireland

A. mediterraneum is a rare moss that is intolerant of cold and hence is restricted to warmer southern districts. It is especially fond of coastal habitats.

View distribution from the BBS Atlas 2014

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