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 312501) with original publication details: Repert. Spec. Nov. Regni Veg. 63: 249 1938.
This name was in version 1 of The Plant List, record kew-312501, and has not been changed.