And Mistletoe Cactus are Rhipsalis. And Rhipsalis is the new name given to many Hatiora.
AND, none of them are a cactus.
So now that we are all confused and all right as well, don't you love the endless name changes. Some days I just pull out a really old houseplant book, and flip through it remembering the old familiar names, that have been changed at least once.
The simple name Mistletoe Cactus was probably more recognized than either Hatiora or Rhipsalis. I use to be obsessive about having the correct name for all my plants. Not so much any more. Glad you have an id. It's been a very fun plant I have had for years now.