This name is a synonym of Bryum uliginosum subsp. rivale (Limpr.) Podp..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 35152929) with original publication details: Jahresber. Schles. Ges. Vaterl. Cult. 61: 224 1884.
This name was in version 1 of The Plant List, record tro-35152929.