Also some mammillarias who need a name

1.
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2.
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3.

4.


Many thanks in advance

Just back from a holiday in Canada.
Is there something wrong with the pictures?
Nobody seems to answer.

Frederik

Nothing wrong woth the photos, Frederick. I for one must have missed seeing your post, sorry.

So here's my suggestions:
1. is certainly one of the Stylothelae, the radial spines are very fine, almost whispy, so I would suggest M. bocasana ssp. eschauzieri.
2. I would say is M. mystax
3. is M. karwinskiana or one of its close allies, but I think just karwinskiana, showing nicely both the wool and the hairs in the axils.
4. is a bit more difficult, but I would suggest M. geminispina

Hope that helps.