This name is a synonym of Riccia glauca var. japonica (Stephani) S. Hatt..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 35205896) with original publication details: Bull. Herb. Boissier 5: 106 1897.
This name was in version 1 of The Plant List, record tro-35205896.