Xmas Cactus

I was attracted to do a super macro blip of this cactus by its very uniformity and order and therefore I was really surprised when I had magnified about sixfold to find such a level of disorder behind each of the spine clusters. If I had done a straight macro initially and zoomed in I would have seen straight away that the white background to each cluster was in fact a mass of squirly white fronds (excuse my lack of knowledge of the proper botanical terms ). The supermacro shot on the right was created with a inverted wide angle lens and a focus stack of sixteen shots.

We have had this cactus for between twenty to thirty years. In our previous house it used to stand on a shelf above a hot water tank by a window and I was continually turning it to correct its vertical growth as it always inclined towards the window. Now it is in a north facing room well away from the windows and it naturally maintains its vertical growth.

It used to bloom every couple of years with flaming red flowers around about Xmas time but it has not bloomed for years now. I would be interested if anyone can tell me what sort of cactus it is.