What a beautiful plant. I'm going to look into those - I have a small (~20 or so) collection of various orchids, so an orchid cactus seems to be an appropriate addition to the family!
Another one "Created" by Grand ~pa ... found online for sale ...
Full Description: Epiphyllum Hybrid 'LEMON PUNCH' Has a Large bloom with dresden yellow inner petals and sulphur yellow outer petals, ruffled,overlapping cup and saucer form,stamens circle style green,thick flat growth with some triangular. Hybridized/registered by D LABORDE(SLR). A cross of ‘George French’ x ‘Jennifer Ann’. Reg.# 10156