Mammillaria glassii ascensionis

This Mammillaria species is of relatively recent discovery, first described in 1979. Ssp ascensionis is a much larger variety with larger flowers.
M. glassii is one of a few Mammillaria species with hear-like spines, always an attractive feature on a plant. When grown on strong light, the plants looks like a white hair-ball, tiny red hooked spines barely noticeable.
The plant in picture slowly develops a cristate - as the growth point turned to growth line and becomes wide with every season. This feature, also called fascination in plants, is not too rare but uncommon.