Help me ID this, never heard of it before
So a buddy of mine who is quite the prolific grower in his own right who I’ve gotten several cactuses off before , I purchased a cutting from but have been unable to confirm its identity. I was told it’s called San Pedro Island shift. I was not able to find that specific strain I did find the San Pedro Island website and contacted them to ask them if they had one called shift. They said they never heard of that before. The grower I got it from said it’s called shift because it shifts and smooth out in some places and then goes back to being ribbed again. This grower is very knowledgeable and I’ve gotten confirmed types from him before so I have no reason to doubt him, I just can’t confirm the name he told me exists.
Does anybody have any ideas of what it could be?
The last pic is where the cutting came from it’s the tall, smooth cactus in the middle