Haworthia 'White Ghost'

The plant is very proliferous and survives being grown in my greenhouse.
I have it labelled as a Haworthia acuminata problem is wh...Read Moreat species to put the variety in because M B Bayer keeps changing his mind. The world checklist of plants recognises it now as Haworthia pygmaea var acuminata.
It is clearly variegated but might not be a cross between species.

I initially thought this was another species of Haworthia. But I have info from a fellow in Germany, who has over 700 Haworthias in his c...Read Moreollection, that this is in fact a hybrid cultivar. He wasn't sure of parentage but I see some Haworthia mirabilis in it.