I've been growing cacti for a few year and dont have ID for a number of them.
Any help would be much appreciated.
Looks like a baby Echinocereus grusonii.
E. grusonii for sure. These are very typical as seedlings.
I have a couple of these I have grown from seed. Some are very green with golden spines. But I have some others that are more pink/green in the body (they may have got a little tanned...) with white spines. They have exactly the same growth pattern, but with closer together tubercles. Is this the same species? a variation? Or are they something else entirely?
On a different point, when do the tubercles become the ribs you see in old grusonii?