Can anyone please help me identify this cactus? I have searched everywhere but can’t find anything. The closest I have gotten is notocactus herteri. But I can only find one picture that looks like mine. Mine has a sort of pebble looking stem under it, but it’s still growing thorns down there and flowers up top so I’m taking that it is still healthy. I included the picture that I have found online that looks like mine, but when I type that name in, non of the cactus have the stem that mine does. Did I do something during the growing process that made the stem look like that?