that is very cool HN!
I haven't seen many of this genus in Aus in general, but i'm pretty sure i saw a large grafted specimen of this species at a certain cactus show last year.
Pediocactus reputedly refuse to grow on their own roots in cultivation.
do you have any larger specimens?
here is the coolest one IMO:
http://www.cactus-art.biz/schede/PEDIOCACTUS/Pediocactus_peeblesianus/Pediocactus_peeblesianus_menzelii/Pediocactus_peeblesianus_f_menzelii.htm
awesome spination.
Toumeya papyracantha is also called Pediocactus papyracanthus.
have one or want one?