The first one is gymno offset and the second one is astrophytum asterias, the stock is Opuntia (Austrocylindropuntia subdenudata?). After multiple attempts the seedlings seem to be still alive at last, wish me luck especially with asterias!
Thank you, psi,
I have tried grafting before with very small seedlings (2-3 weeks old) without applying any presure and they all died. With these I used adhesive tape.
Nice. It looks like you used C. subulata. Everytime I used it, the whole top turns black like those few spots on yours. Needless to say I then lose the graft.
I wasn't raised a Cactolic but converted to Cactolicism later in life