Cactus / fissuratus

This cactus is an Ariocarpus fissuratus f Big Bend, was in flower yesterday afternoon.
I bought seeds and sowed on 31/10/2003.
Young seedlings were grafted on hylocereus stocks just after germination.
I degrafted this in 2007.
Since fussuratus was hard to stop liquid running down from cutting face, I used a special method of degrafting. A short vascular bandole of hylocereus was remained at that time.
I think the short vascular bandle has been dead and the cactus has relied on own roots.