Txs for ur comment. Isee. I wonder how they would get end up with...

Astrophytum Myriostigma Cv. Onzuka

Colors may vary. The white areoles on top do not always show-up. Do you see any flower buds on top?

No flower buds so far. lts just like a ball.

A mushroom?

Im with asclepiad fan on this. As weird and not cactus-y the thing looks, the grafting stock is a harissia jusbertii, and the id matches......

I guess the fact that its surrounded by astrophytums, mutant and otherwisde would make sense....

Looks like a good call, Asclepiad!

Where were these seen?

When I first saw these pics I was reminded of moldy citrus;).

Moldy pic from the interweBs.

Beauty is definitely subjective;).

Apparently they are mutant Astrophytums and lost their growing points. So l got told theiy are not getting bigger anymore but only produce their babies from the sides...

Thanks guys for ur helps!

HU-537473, I wonder how the juvenile form looks like, before it reaches its final size and loses its growing point.

I'm a fan of a lot of different plants, but I doubt I could ever get into a good feeling about these. Don't really care for the mutant 'Moon Cactus" but at least they grow and look like plants.

These are real plants - there is an Astrophytum cultivar that you'd swear is a human wen with scabs. It is completely unlike any Astro ever seen before. It's not as well-represented as other Astro cultivars / hybrids due to its perceived ugliness.

Hu et. al.,

This is my friend's plant - he doesn't have a name for it, but it's a real monstrose monster. You can see that weird outer layer consuming what had been a normal plant (or so it seems).