Astrophytum myriostigma nudum?

Or is it Astrophytum myriostigma var. strongylogonum?

 

This was part of the private collection of cacti and succulents at Manor Nursery, Angmering, West Sussex. The collection was started in 1948. The nursery is now gone. The collection has been dispersed to various new locations.

 

Astrophytum myriostigma is called "Bishop's Miter" or "Bishop's Cap".

 

Synonyms and cultivars include -

Astrophytum columnare, Astrophytum tulense, Astrophytum myriostigma var. potosinum, Astrophytum nuda, Astrophytum myriostigma var. viescaensis, Astrophytum coahuilense, Astrophytum prismaticum, Echinocactus myriostigma, Astrophytum myriostigma var. multicostatus, Astrophytum myriostigma var. columnaris

 

Astrophytums are native to Mexico.

Done