AbstractSphagnum. inundatumRussow emend A. Eddy is lectotypified and combined withS. sub secundumNees at the level of subspecies.S. auriculatumW.P. Schimper is a genetically distinct, but morphologically similar, species.S. subsecundumNees subsp.subsecundum, S. subsecundumsubsp.inundatum(Russ.) A. Eddy,stat. nov. andS. auriculatumW.P. Schimp. are described and figured and a key to their identification is given.