Cactus / retusus

A degrafted Ariocarpus retusus v major cv Daruma-royal was in flower.
I bought seeds and sowed in 2004.
Selected young seedlings were grafted on Hylocereus and degrafted later with a short vascular bundle of the stock.
The plant relied on the vascular bundle a while but it was switched over to own-roots.
I confirmed it during last repotting.