Ubelmannia pectinifera

Ubelmannias are native to  Brasil where they grow in rocky arid habitats, surrounded by grasslands and semi-dry forests. Older habitat plants often develop white stem color, similar to many Copiapoas, and like Copiapoas, cultivated Ubelmannias very rarely do that.

Mammillaria perezdelarosae andersoniana

6 months old seedlings.

Eriocactus (Parodia) warasii

Eriocactus is a small group of species now listed under Parodia with distinct flower, almost identical among all species in the group. All the Eriocacti are by far the largest in the Parodia genus.