Aylostera knizei (Rausch) Mosti & Papini

Regarded by some as a form of Aylostera diersiana, which itself is sometimes regarded as a form of A. pygmaea. Yellow flowered like A. diersiana but with brown-felted areoles, not white. 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 knizei VZ182

Aylostera knizei WR676a