How do you tell t. peruvianus and t. pachanoi apart?

For instance, is the following picture one of those and how would you tell?

To start with Pachanoi has short spines. so it aint pach.

good links for more info
http://www.columnar-cacti.org/trichocereus/page4.html
http://www.trichocereus.com/peruvian_torch4.htm

Both of these links will give you a much greater understanding of the whole family. It is a topic of great length and one that you will gain knowledge in time by seeing and being around lots of diff tricho's, Also help to see them when they are a little older. other wise ID can be difficult with smaller plants.

Hope this shed's some light for you and helps you out. I wish I knew where on the forum was a previous thred with lots of info on this subject but im sure if you have a look through some older ones you will find more.

-A

What happened to the other posts on this thread?

Different thread, same picture

AmnesiA wrote:

To start with Pachanoi has short spines. so it aint
pach.
...
Both of these links will give you a much greater understanding
of the whole family...

Thanks for the info. Indeed it doesn't look like a pachanoi, except people keep telling me that it is, including the guy who sold them. Very confusing. Is it possible for a pach to have such spikes? It looks a lot more like a t. peruvianus to me.

cryptocarpa wrote:

What happened to the other posts on this
thread?

Hellonasty wrote:

Different thread, same picture

Yeah I had a related but different question so I used the same picture.