what is LAU 1128 ?

LAU 1128 - collector: Alfred Bernhard Lau
species: Mammillaria lanigera
locality: Yolox-Quiotepec, Oaxaca, Mexico
altitude: 2100-2200m
date: 03/05/1977

seeds offered in 1999 by Mesa Garden
MG 705.8 - ignota L1128 Yolox, Oax, flat white wooly stems

mammillaria lanigera or mammillaria ignota?

Lau discovered his L1128 on 3/5/1977. His notes go on to say that "I regard this taxon to be a form of Mammillaria supertexta. I had shown the habitat to Werner Reppenhagen. He described the plants in 1987 and compared iyt in the original description with Mammillaria huitzilopochtli".

Of course these days, both lanigera and ignota are subsumed into M. albilanata ssp. oaxacana, and I think this is correct. This species is very variable, and across Oaxaca you will find all kinds of variability of this subspecies.

Why Mesa Graden have decided to change the name in their listing, I don't know.