Aylostera tamboensis (F. Ritter) Mosti & Papini

Regarded by some as yet another form of Aylostera fiebrigii. Clustering a bit, with slightly flattened spheroid green bodies covered in longish white spines with yellowish brown tips, projecting at angles from the body. Flowers are usually orange-red with pinkish flower tubes, white stigmas and yellow or orange stamens.

The description is here.

Plants of this species in the collection include:

Aylostera tamboensis

Aylostera tamboensis FR1142

Aylostera tamboensis L585