Discocactus

It has flexible interlacing spines up to 1-2 cm long, that are pectinate, flexible, creamy white or whitish-yellow with dark tips, recurved backwards, sitting on the plant like spiders.

Discocactus horstii is a small solitary cactus with a blackish discoid body typical of this flat and globular genus. The cephalium is covered by the flowers that come out of it. These cacti possess an exotic appearance shared by no other cactus.

The variety pulvinicapitatus is a particular form of Discocactus placentiformis, distinguished by the shape of its body, which tends to be more flattened and develops a more pronounced and "cushion-like" cephalium.