Biantheridion undulifolium (Nees) Konstant. & Vilnet [Jamesoniella undulifolia (Nees) K. Müller] (Jamesoniellaceae) in the Pyrenees - Distribution, ecology and conservation in south-western Europe
Biantheridion undulifolium is a very rare liverwort worldwide. The species is newly recorded in the Pyrenees. An updated European map is drawn. Ecological requirements and conservation strategies are provided with a focus in south-western France.