Not so sure about this one.
Hi, I agree. Maybe Th. rinconensis. (?)greetz Hablu
Yes, looks like rinconensis. I think it has a couple of other names that might be rinconensis subspecies now, or maybe the other way around :)
Isn't that a interesting plant. Very nice
Hello James, it looks like T. nidulans, which is now a T. rinconensis form.
I don't think so, you should look for Thelocactus hexadrophorus v. fossulatus.