Im going with Saguaro's guess, pic would be could just for clarification.
Im guessing its just the normal tephro segment's which he is referring to.

Nice looking plants, wish i had some Escobaria

I knew my Echino wasnt durangensis!

2 and 5 possibly Eulychnia species?

From Corowa eh? I havent been there for 10 years, nice place.
Im just gonna go with C.Peruvianus, just as it would probly be more then impossible to correctly id it.

I have no idea, but i really really want it

Looks more like T.pachanoi to me, but i dont think it is. Im guessing its not C.Peruvianus.

I dis agree Hob, my baldanum looks the same as Ken and Tony's, with myne bearing pink flowers, plus it came labeled as G.baldanum.

It sure as bloody hell can stay away from my house, theres a heap of wild opuntia growing up the back of my house, one night opuntia, next night Astrophytum.

1st is a Selenicereus sp i believe.

Looks like you just lost your bet alot of times over

Im not really a fan of this plant, nor the non-monstrose form, but id love one as old and tree like as this one

Its also interesting how some stems have reverted back to normal growth and have become non-variegated.

Looks to be etilioated to me.

Thats a doosy.

Absolutely awesome, ive been thinking about getting into columnars alot more, as they come by around here alot, and you always find one you havent seen before. But nothing as good as those
Im after a Cipocereus minensis at the moment, i love the blue buds.

Not to jump the gun, but perhaps he just wants a nice blooming Loph, but all he knows them as are Peyote cactus?

But say a nice 4-6yro plant leads me to think otherwise.

I personally think it looks great like that
Some people just never agree with me