I brought these two FAT cuttings back on the plane from a recent trip to Tassie. I got the for free off a large specimen growing in the ground outside approx 3.5m tall with many branches and typical white Tricho flowers everywhere. the skin is blue except where it got rubbed off due to excessive handling. I think that they could be Trichocereus peruvianus?

I agree, it looks like a variety of Echinopsis perviana.

cool thanks.

I'm no expert but are peruvianus spines that long? I would have leaned towards a T.B. Sure someone with more skills will post soon.

i would go with peruvianus.
the notches above the areoles are pretty consistent with the species.
as far as spine length,it's variable, i have a couple with spines up to 2".

Could well be peruvianus, but don't discount macrogonus or cuzcoensis... A lot of it has to do with the colour of the spines, (yup, they are that long) and what they stay as when they are old... I'm thinkning peruv due to them staying brown in the lower regions.

Macro/cuzco usually turn whitish, but with similar spines...

I'm going to go with E.peruviana for now, unless someone can prove otherwise.

That's a pretty unusual cactus there lewis, a little hard to narrow it down to a species with certainty. Peruvianus would be pretty close but trichs show a lot of variability, you can name them just about whatever you wish IMO. It's probably a hybrid. Very nice plant though. Nice and round with cool spination.

There's enough confusion in regards to Trichos as it is. Why are we trying to makes things more complicated. That plant is obviously what a lot of people have in their collections labeled as either Trichocereus peruvianus or Echinopsis peruviana.
It's blue, there's well defined ribs, the spines are longish. Without seeing the growth habit and flowers its hard to ID any better than we already have.

Ah-hah! It has some black spines though! I am going out on a limb here and going to say it is somewhat close to T. glaucas

At a glance I would definitely say peruv though.

Could be bloody anything. It's a Tricho though, of that we can be certain.