This name is a synonym of Gasteria carinata var. verrucosa (Mill.) van Jaarsv..
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 297514) with original publication details: Trans. Linn. Soc. London 7: 12 1804.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:529545-1.
This name was in version 1 of The Plant List, record kew-297514, and has not been changed.