Justification: Micranthocereus auriazureus is listed as Endangered due to its very restricted distribution, the extent of occurrence below the threshold for this category and the species has less than five locations. Although more than half of the population is within a protected area, the quality of habitat for the species outside is continuously declining due to fires, deforestation, forest plantations and agriculture.
Micranthocereus auriazureus is native from Grao Mogol Cristalia and the northernmost part of Botumirim, northern Minas Gerais. It is endemic to the core area within Minas Gerais. It grows at elevations of 750-1,000 m asl.
Micranthocereus auriazureus is mainly affected by deforestation for charcoal production, conversion of the habitat into agricultural land or Eucalyptus plantations and man-made fires are the main threats to the species.