The input is not mine I must admit, I have very little knowledge about things I have not propagated. My dear friend is affiliated with the Atlanta Botanical Gardens and is a collector of many of these plants. The other night I ask him to check on some info I put in to my list to make sure it was accurate. He did then he lurked around and found this ID thread. He seemed very sure about what it was. That does not mean it is it. Without actually going to a site like Cactiguide or people who are constantly dealing with these plants it is really difficult to be sure and we just keep on guessing. I personally use the Cactiguide for any questions I have regarding questions I have on all of the cacti I propagate. When selling, I just must be accurate. I have received too many things that were incorrectly marked over my years to trust everyone. It is amazing how some of the biggest sellers do make mistakes...as I am sure you know. She could send her pictures to them to be sure if this is something she wants to keep on working on. Cactiguide.com