Article

The arcto-montane thalloid liverwort Mannia triandra is reported for the first time in Spain, on the Balearic Island of Mallorca. The species was discovered in December 2022 at a unique location in the famous and bryologically celebrated Serra de Tramuntana. The specimens from Mallorca and their ecological environment are described. Diagnostic characters are discussed and a comparison is made with other Marchantiales species with which confusion is possible. A key to Mediterranean Mannia and Asterella without spores is provided.