This name is a synonym of Riccardia flaccia (Stephani) S. Hatt..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 35192112) with original publication details: Sp. Hepat. 6: 26 1917.
This name was in version 1 of The Plant List, record tro-35192112, and has not been changed.