This name is a synonym of Cymodocea serrulata (R.Br.) Asch. & Magnus.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 303780) with original publication details: Bot. Mag. (Tokyo) 26: 211 1912.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:699611-1.
This name was in version 1 of The Plant List, record kew-303780, and has not been changed.