This name is a synonym of Adiantum tenerum var. littorale (Jenman) Domin.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 26622598) with original publication details: Ferns Brit. W. Ind. 96 1899.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:17011200-1.
This name was in version 1 of The Plant List, record tro-26622598, and has not been changed.