This name is a synonym of Ruppia cirrhosa (Petagna) Grande.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 286894) with original publication details: Bot. Mag. (Tokyo) 49: 687 1935.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:699844-1.
This name was in version 1 of The Plant List, record kew-286894.