This name is a synonym of Riccia glauca var. subinermis (Lindb.) Warnst..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 35209234) with original publication details: Helsingfors Dagblad 1881 (96):  1881.
This name was in version 1 of The Plant List, record tro-35209234.