Thanks, I did a few more photos in the garden but decided to limit my data usage until I do a montage of them all.
Fifth one down that you highlight as a matucana peruvianus was obtained labelled as a macrogonus (and, incidentally is my wife's favorite besides the TBMs).
The last pic, identified as AWC 342, has interesting spination that combines a terscheckii (and beyond!) degree of spininess with a Matucana-like, dark-tipped appearance to the spines themselves, whereas (in my limited experience, at least) the true terscheckii spines tend to appear somewhat stripey. It does have the yellowish cast common to terscheckii but the notch above the areole is even deeper; the sinuous outline of the ribs catches my eye too, as well as the way the areole has developed in two separate phases.
I'll be interested to see how these ones look in a few years. They're already stretching out a lot more than the confirmed tercheckiis which by comparison were a lot more globular-looking at first.
Sorry, gone off on one there a bit - but here's a picture of my big terscheckii for comparison. It's just the very first pic in the OP seems to have rather prominent areole fuzz for a bridge. Second photo below is a bridgesii for comparison.
(If anything, a bit of rot potentially helps an extraction by weakening the cell walls and maybe even stimulating additional alkaloid production.)
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(2,138kb) downloaded 26 time(s). “There is a way of manipulating matter and energy so as to produce what modern scientists call 'a field of force'. The field acts on the observer and puts him in a privileged position vis-à-vis the universe. From this position he has access to the realities which are ordinarily hidden from us by time and space, matter and energy. This is what we call the Great Work."
― Jacques Bergier, quoting Fulcanelli