I don’t have the slightest idea what this is. It’s unlike any of my other flat large clade Rhipsalis. The clades are larger than most and very thick. The margins only have slight crenations. There are small hairs at the young areoles. This one will be interesting to see bloom, although I’ve had it for 4 years and it hasn’t done so yet. The tan coloration on the branches is corking, many cacti develop this appearance on older branches as they age.