I'm not sure this is M. geminispina. I would like to ask @skopjecollection and @mcvansoest to take a look and tell me what they think. This extreme clumping behavior is not typical of the species.

Here is your problem
https://www.tokopedia.com/java...
if @Kaktus would be so kind to translate..
Otherwise this misinformation is why we cant have nice things,
I dont know what this is but it could be some mutant judging from the weird offsetting

Escobaria sneedli?

The clumping seems excessive but who knows it could be something that they selected for in propagation, what the main question is to me is does it have black tipped spines, from the picture I'd say not, and afaik most geminispina have black tipped spines.

I have one that is clumping a lot, but not quite like that, but it means that to me the clumping cannot be the main reason to say it is not, but combined with other reasons it could be an argument.

Anderson describes two subspecies of geminiflora: the typical one with 2 central spines that are white with dark tips; and leucocentra with 5-6 pure white spines. Pilbeam pictures leucocentra and some of the spines have dark tips... but there are definitely a greater number of them, and some are pure white. In any case, counting those central spines may be helpful. To arrive a proper ID independently from the seller's conclusions, we would probably need a close shot of the stem at the top (with good light and in good focus) and ideally a flower pic. Bear in mind there are ~170 species of Mammillaria (depending on how you count) and if this is some kind of oddball cultivar, then all bets may be off.

Try to get a clearer shot of the cactus, the shape of the cactus is quite long like elongated cacti, and the spines are not sharp, you rub it with your hands without getting hurts. Feels like soft baby tooth brush. Hope this can help for the ID.



Sorry for the problem caused

I am drawing a blank here.

The central spines on geminispina are stouter and more prominent compared to the radial spines, making them quite distinct. I am seeing 1 or maybe 2 central spines in the photo (hard to tell really) but no dark tips. That would put it in the genus, given the wool and bristles just barely visible in a couple of axils (the part of the stem in between the tubercles). A flower picture might get you closer to the answer, if nobody else has it pinned down.

Too bad that cactuses are very difficult to bloom in Indonesia, we don't have winter to let them rest and collect energy to bloom. But we can enjoy something like 12 months growing season as an exchange

Moved to the genus entry for Mammillaria.