Regarded by many as a form of Aylostera steinmannii. Found to be distinct enough to be given specific status by Mosti & Papini (2011).
Quite densely spined, with yellowish spines, this orange-flowered plant tends to have larger, more spherical bodies than other A. steinmannii types, but can elongate with age.
The original description is here.
Plants of this species in the collection include:
Aylostera christinae MN318
Aylostera christinae WR492