This name is a synonym of Uebelmannia pectinifera subsp. flavispina (Buining & Brederoo) P.J. Braun & Esteves.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50181484) with original publication details: Succulenta (Netherlands) 52(1): 9 1973.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:259302-2.
This name was in version 1 of The Plant List, record tro-50181484, and has not been changed.