I bought 50 of alonsoi seeds and sowed on 31/08/2006.
I grafted young seedling quite many. Two of them were changed to the plant showing on the photo.
It is Turbinicarpus species but is not alonsoi at all.
Similar problem would be happened from time to time with purchased seeds but it is hard to gess the name exactly.
I creaned remained flowers and took the photo. I could also see some seeds. It might be a self-fertile species of Turbinicarpus, which is not common.