Reburia pseudodeminuta 'robustispina'

Reburia robustispina displays why this genus is so popular among collectors.

This form of R. pseudodeminuta has more stout spines, not so well developed in my plant. The reason for that is that in my greenhouse it is too hot for this mountain plant, and to prevent sunburns I have to keep it under partial shade. It will do much better if grown outside in my climate.