Aylostera melanocentra (Rausch) Mosti & Papini

Regarded by some as a form of Aylostera steinmannii. Initially described as such, this plant differs in its brownish tipped marginal spines and black central spine (hence the name). Found to be distinct enough to be given specific status by Mosti & Papini (2011).

The description is here.

Plants of this species in the collection include:

Aylostera melanocentra WR744