Status in Britain: Nationally Scarce

A thallose liverwort, consisting of a thickened midrib bordered by delicate "wings" a single cell thick. These wings are folded to give a "rouched" appearance to the plant, which is a bright- to dark green in colour. In Wales this species is almost exclusively found in dune-slacks (it is known from one inland site in sewage filtration beds at a water-treatment plant.)