Dyckia fosteriana

This Dyckia needs to be protected from the rain to keep in good color.

How many forms of Dyckia fosteriana are their?

As far as I tell 5. Well maybe.

Dyckia fosteriana-fosteriana

Dyckia fosteriana nivosa
Dyckia fosteriana rubra var. marialava
Dyckia fosteriana var. robustior
Dyckia fosteriana cv fosteriana-fosteriana var. Nels Christianson

Constantino at http://dyckiabrazil.blogspot.com/

has the 5 listed plants with photo's on his blog.
Don't know if he is correct or not.

FCBS Bromeliad Species Online Database only has 2, they are:

Dyckia fosteriana
Dyckia fosteriana var. robustior