Well, decided to officially dive into the world of cacti cultivation. I've grown some (PC?) Pachanoi over the past few years with a buddy of mine, mainly just for the sake of growing. Although we'd taken several feet from it over the years just to get a few doses, nothing spectacular, as they were smaller dosages. Other than that, most of what id worked with prior was pre dried.

Anyhow, I recently went through companion plants for my trichs. I always loved their selection, also them being relatively close to me.

I recently purchased 4 Trichocereus from them - (2) Peruvianus, (1) Bridgesii, and (1) Pachanoi var. 'spiny backerberg'. Im fairly new to cacti. Been reading through host's article in the Nexian, and been following M S Smith on the Corroboree, along with Trouts work (which i've briefly skimmed through before).

Basically I just wanted to post some pictures of what I received and get feedback on what exactly I have. They all received tags when I got them from companion, although after hearing different things from a number of people, id like to post them here for further clarification, especially on the pachanoi var spiny backerberg (which I skimmed through trouts notes regarding this and it seems to be mostly a myth, and not actually related to backerbergs original black and white photo in his "1959 Die Cactaceae" piece.

Anyways, here's the pics:

The top 3 were taken from the two cacti labeled to be peruvianus. The next 4 down were taken from the one labeled to be bridgesii. Then the bottom 3 were from the one labeled to be the pachanoi var spiny backerberg.

I'm just about to go the same way, Tattvamasi. Let us know how it all goes. I'll be interested to hear what the experts say about your photos.

Good luck with it all

Its super hard to tell... But from the profile i'd say the Peruvians looks legit. As for the spine formation someone else will have to answer that, but to me i think it looks good.

The other looks like a bridgesii (one that i dont have either )
Here is a photo i have of a t. Pachanoi from a plant book from 1970 idk if its helpful but thought i'd share since its the closest oldest photo of a trich that I own. you might need to wait for a few of them to get older and develop more mature looking nodes.

I'll back up the opinions here, the peruvianus and bridgesii both look like what I understand them to look like. I can't comment on the (alleged) pachanoi var. 'spiny Backeberg', although it is within the description of a pachanoi:
(from wikipedia)

Thank you for the feedback. It's much appreciated <3

The last one looks awfully Bridgesoid. Cool cacti for sure though.