T. pachanoi rootstock
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Astrophytum Caput Madusae (3mo. old seedling)
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Ariocarpus retusus (also 3mo.)
3 & 4. Lophophora (either Williamsii, Fricii, or koehresii)
The solo head was chopped off the one growing on really scarred rootstock with all the areoles cut off. Then what was left pupped another head.
by Sophilosophical