It is a rhipsalis. Not sure of the species,but a childhood without a doubt.

Getting closer. I googled rhipsalis species and couldn't find one that looks exactly like my cactus, but it has a much stronger resemblance to rhipsalis than to opuntia, so I'm inclined to agree with you, Rob.

Based on Rob's ID of the genus and me looking at pictures at CactiGuide.com I think it might be R. cereoides. https://cactiguide.com/cactus/?genus=Rhipsalis&species=cereoides

I will not argue Polypompholyxs IF of the plant. I would suggest the Rhipsalis group on TH is the best place to US a rhipsalis.

On FB. Man a bunch of autocorrect errors.

No idea what that meant Rob, can't even guess. What's TH?

That's what he meant by autocorrect errors.

tj

TH=FB on my Amazon tablet.

I took a look at R. cereoides, and while there are certain similarities, I don't think that's it. The growth pattern is very similar, but R. cereoides seems to be quite angular, with distinct ridges along every segment, while my cactus only shows ridges on some of the new growth segments. The older segments are all flattened and have an elongated teardrop shape.

Thanks for suggesting FB. I never even thought to look there.

Hatiora rosea? it looks a lot like a hatiora

netia, I noticed that too but it isn't unusual for some epiphytes to switch between flat (2 sided) and multi sided (3 or more) branches and different growing conditions like different amounts of light can tweak new growth, too.

Polypompholyx, thank you for that observation. I'm going to label it "R. ceroides(?)" for now.

Stefan, thank you for your suggestion. I will note it down as another possibility.

I agree with Stefan, it looks like a somewhat etiolated Rhipsalidopsis/Hatiora rosea to me. They do tend to develop both flat and three sides segments. My great-aunt always had several pots of them, and the ones that got the least amount of light, looked like this. With stronger light they are more compact, and the body colour becomes reddish. These days there are many hybrids with larger flowers or more colours besides the original pink.