Aylostera pulvinosa (F. Ritter & Buining) Backeb.

This is a very distinctive plant once it gets past a few years old. The name means “cushioned” and it does indeed form large dense cushion-like clusters (albeit one you would not want to sit on!) Usually the spines are short (although longer spined varieties do exist) and the flowers are relatively small and orange.

The description is here.

Plants of this species in the collection include:

Aylostera pulvinosa

Aylostera pulvinosa FR766