I have a couple of plants of Mamillaria rhodantha ssp odieriana ROG630 from Palo Bendito, Veracruz, and have just sown seed from the AfM distribution of Mammillaria rhodantha ssp fuscata ROG476 from Magdalena, Hidalgo. I don't have access to the original description of ssp. fuscata which I understand was by Pfeiffer in 1837, although the original description of odieriana by Lemaire was in 1834. However in Craig, odieriana is put as a synonym of fuscata.
Anyway, my real question is whether anyone knows what fuscata ROG476 is? It comes from an area well to the west of Pachuca and is a great distance from the Veracruz border area where ROG630 comes from. Are they identical or genuinely different?