Can anyone help with quite a few ID's?

[Cactipod]

Good Afternoon all,

As I have recently re-started collecting cacti and succulents, I have quite a few that are nameless. Any help would be very much appreciated. I will add two at a time

thanks
Ellie

Is this a mammillaria?

There are two flower buds appearing in centre.

[Cactipod]

Here is a couple more

Really not sure what this it. It has white powder covering the flesh.

This one is very small but ive had it about 3 years.

[Phil_SK]

I'd suggest Mammillaria schiedeana ssp scheideana and Gymnocalycium buenekeri.

[Cactipod]

Thank you phil !

Here's another one ... he's one of my favourites

[sechjoh]

#2 Gymnocalycium horstii in your first post...

[Cactipod]

#2 Gymnocalycium horstii in your first post...

Thank you so much Christer. I've just looked at some internet pictures of it. Now I am extremely excited for the flowers to bloom.

[iann]

Stenocereus pruinosus.

Is that last one an unusually tall Sulcorebutia?

Then there is a Mammillaria karwinskiana ssp nejapensis, with Mammillaria elongata photobombing.

[KarlR]

I suppose the columnar bluish one could be a short spined Stenocereus pruinosus as iann suggests, but to me it looks more like Myrtillocactus geometrizans. No idea what the plant in the background is though.

Edit: on that photo, the one in the background to the left that you only just see is another photobombing (brown-spined) Mammillaria elongata.

The small one you've had for three years is a little bit difficult to judge, but I think it could possibly be a Rebutia/Aylostera heliosa or Lobivia famatinensis. It's etiolated a bit so it's difficult to say. It should be of flowering age so you'll likely be able to tell what it is once it flowers.

[iann]

Myrtillocactus geometrizans makes more sense.

[IanW]

Yep, it's definitely M. geometrizans, I think that white powder is actually blue!