That's pretty cool. It probably has to do with the spectrum of grow light it is under. I had a San Pedro cutting sitting in the dark for a few months and it sprouted a pup that grew to about a foot tall and and an inch wide and was completely albino. When it started getting some light from a CFL bulb it started to get a bit of green color, but was still mostly white or colorless.
Using pereskiopsis to graft sacred cactus to is a very interesting idea. AFOAF has several peruvian torch babies grafted to pereskiopsis and they are starting to plump up considerably. It really speeds up the growth cycle for seedling cactus. You could have a whole forest of sacred cactus and pereskiopsis indoors, even in the deepest winter cold as long as they get proper food and light.
Let us declare nature to be legitimate. All plants should be declared legal, and all animals for that matter. The notion of illegal plants and animals is obnoxious and ridiculous.
โ Terence McKenna
All my posts are hypothetical and for educational/entertainment purposes, and are not an endorsement of said activities. SWIM (a fictional character based on other people) either obtained a license for said activity, did said activity where it is legal to do so, or as in most cases the activity is completely fictional.