This name is a synonym of Crassula tetragona subsp. lignescens Toelken.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Calyx 3: 104 1993.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:970526-1.
This name was in version 1 of The Plant List, record kew-2742757, and has not been changed.