Some very nice plants there Cactuscook !

No tricks needed for Copiapoa seed TasV. Viability is usually pretty good, but fresh seed is best. Treat them the same as your other Cactus seed with warmth and humidity. They are usually very quick to come up too.
C. malletiana is usually known as C. dealbata these days...but I guess that depends on whose naming system you want to use !

I bought it as dealbata... Desert Tropicals lists dealbata as a synonym of malletiana (see: http://desert-tropicals.com/Plants/Cactaceae/Copiapoa_malletiana.html)... so hard to keep up with the taxonomic nomenclature boffins or even to know which one is which

Edit: it's also refered to as malletiana on the ICON allowable imports list too: http://www.aqis.gov.au/icon32/asp/ex_casecontent.asp?intNodeId=8434932&intCommodityId=566&Types=none&WhichQuery=Go+to+full+text&intSearch=1&LogSessionID=0

CactusCook, yes Copiapoa krainziana is a very cool plant and pretty distinct amongst the Copiapoas. Maybe someday your plant will be like this ! Might be something like 70 years or so from now though....

now thats a great photo its amazing that these plants can survive in such harsh conditions.

Some of my copiapoa.

Love the photo of krainziana in habitat im lucky a good friend has been on cacti expedition in sth america for the last two years these plants were his that he grew from seed he collected last time in chile cant wait to get my hands on some more of these beauties they truly are unique how they survive in habitat. He will be back in adelaide in time for november society show and will have many plants for sale.

Notocactus magnificus

Well now the gymno's i have many love em.

I'm digging that Noto magnificus... how old is that beauty?

The noto would be about ten years if you put them in the ground when about the size of two tennis balls they will grow quiet fast i have heaps of these and put little ones in the garden everywere they are a nice looking plant i think.