Mammillaria magnimamma

Mammillaria growing with an L. williamsii population in the Real de Catorce, SLP. This is probably a form of magnimamma. It could also be compressa ssp. centralifera as both plants have forms that can exhibit these long curved spines. The shape of the tubercles suggests it is M. magnimamma.

Mammillaria growing with an L. koehresii population in Tamaulipas. This too is most likely a form of magnimamma.