Beaked beardless moss Weissia rostellata

Status Non-native, invasive
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A small moss that grows in loose tufts on damp soil or drying mud.

It has always been regarded as very scarce in Britain and rare in Ireland.


This moss grows on nutrient-poor muds on the edges of ponds, lakes and reservoirs that are exposed when water levels fall. Trampling of mud by cattle seems to assist it.

Key threats

Stabilisation of water levels (for recreational or amenity purposes) and water pollution by over-enrichment from farm fertilisers are both current threats, as is the encroachment of the invasive Crassula helmsii.