I have never been a fan of cactus hybrids I am afraid always finding the true species more interesting, but each to his own. The true species often seem to have died out in cultivation after their original introduction and use to provide more hardy hybrids, therefore are much harder to obtain. Finding a Schlumbergera (Zygocactus) truncata propagated from authentic habitat material is like finding "hens teeth" as most under name "Zygocactus truncatus" in cultivation are now complex hybrids.
I have just managed to get hold of habitat material of Schlumbergera (Zygocactus) russeliana, the other parent of the well known "Christmas Cactus = Schlumbergera (Zygocactus) X 'Buckleyi'. I am now after S. orssichiana and S. kautskyi. I already have Schlumbergera opuntioides and S. microspherica. It's a pity more people don't grow species epiphytic cacti since the passing off of random hybrids as the true species seems to be loosing them to general cultivation. Try also and find an authentic Disocactus ackermannii. The plant in cultivation usually called "Epiphyllum ackermanii" is in fact a hybrid not the true species and is also sometimes named "X Heliochia vandesii 'Ackermannii'.
http://en.wikipedia.org/wiki/Disocactus_%C3%97_hybridus" onclick="window.open(this.href);return false;
One of the best links on species epiphytic cacti is this (you need to scroll down a bit before it starts):-
http://www.scribd.com/doc/55652457/The- ... ytic-Cacti" onclick="window.open(this.href);return false;
I have just started using Orchid Compost (basically Coco Peat) as part of my compost for epiphytic cacti, with Pearlite and a little soil added.
Cortez previous link to this video shows how they actually grow in habitat. Often our greenhouses are too hot for them in summer and they do better in the partial shade outside, even in the UK:-
https://www.youtube.com/watch?v=S7jYUxg ... e=youtu.be" onclick="window.open(this.href);return false;
