Neither POWO nor Lodé recognize M. rettigiana. Both recognize M. mercadensis.
https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:151559-2Mammillaria rettigiana Boed.
First published in Monatsschr. Deutsch. Kakteen-Ges. 2: 98 (1930)
This name is a synonym of Mammillaria mercadensis
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Linzen 2020 @tholinz recognizes Mammillaria rettigiana
Linzen, Thomas: Die Vielfalt der Gattung Mammillaria. Deutsche Kakteen Gesellschaft, 2020. Print. S. 390-391.