Mammillaria lindsayi

It is a cactacea with an initially solitary habit that can cluster a lot over time. Its stem is globular, with a slightly depressed apex, often completely covered with a white down. It has many conical tubercles, from which numerous white radial spines and longer and more rigid brownish central ones emerge. Flowering forms some sort of a ring on the upper part of the plant, blooming with yellow flowers with shiny petals.