(Hook.) Dumort.
An attractive, dark greyish-green, Hyperoceanic, autoicous leafy liverwort which grows in ravines on shaded rocks which are usually dripping with water. The small underleaf lobule is helmet shaped, but it is the coarsely toothed upper leaves which are most distinctive, somewhat like a holly leaf, hence its common name. As might be expected it has a very western distribution in Britain and is locally frequent in west, mid and north Wales. It is less common in south Wales but some new sites have been discovered in West Glamorgan in recent years. Sporophyte capsules are occasional in summer.
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