Cactus / retusus

I bought seeds of Ariocarpus retusus v major cv Mitsuibo (tri-fingers) and sowed on 11th August 2005.
I grafted several young seedlings.
The photo is one of them.
The character of the cultivar should be appeared when the plant reached to a mature age but unfortunately all of them have never shown it.
It will happen quite often when you started from purchased seeds.