This name is a synonym of Pilosocereus machrisii (E.Y.Dawson) Backeb..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Cacti ed. 2: 148 1951.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:52138-2.
This name was in version 1 of The Plant List, record kew-2709492, and has not been changed.