Does anyone know what this is?

[HaoBao]

I would be grateful for an ID for this one if anyone knows?

[Phil_SK]

Perhaps Copiapoa humilis ssp tenuissima?

[el48tel]

Thanks
I have two unlabelled just like those

[Cidermanrolls]

I agree, it looks similar to Copiapoa humilis. This appears to be a very variable species in cultivation, possibly due to the promiscuity of parent plants?
These pictures are of different forms I have labelled up as humilis, ranging from long thin spines forms down to a very short spines one. I won’t claim mine are all correctly labelled,
What I have labelled as Cop tenuissima (ex Southfield) looks very different to your plant.

[HaoBao]

Thank you for your replies, Is it safe to say it's a Copiapoa at least do you think?

[ralphrmartin]

I'd follow Phil, and call it Copiapoa tenuissima.

[conolady]

I'd follow Phil, and call it Copiapoa tenuissima.

Me too.

[FredG]

First it was orchids, then, since c.2001, cacti and succulents. I'm into South African plants, mainly conos, lithops and haworthias, with a few cacti, especially 'posh' mamms, turbs and other smalls. Now it’s stapeliads as well...

Pssst, has anyone mentioned Carnivorous plants to you?

[conolady]

First it was orchids, then, since c.2001, cacti and succulents. I'm into South African plants, mainly conos, lithops and haworthias, with a few cacti, especially 'posh' mamms, turbs and other smalls. Now it’s stapeliads as well...

Pssst, has anyone mentioned Carnivorous plants to you?

Yes, been there, grown them, still got a few.

[Terry S.]

It should be noted that Ritter's invalid name C. tenuissima was for a plant with short spines, just a couple of mm long. The plant in the original photo above is just a "normal" C. humilis rather than var. tenuissima.