I found a little bit of info on staghorn ferns at this website: www.platyceriumferns.com
I'm trying it with some new spores. There is also info from an Aussie site, do a google search. Staghorns are native to Australia.
Have not tried Pyrossia from spore, but here in New Zealand they grow on lots of the trees naturally, and i often take pieces to colonize a new tree, but they are slow to start again. Now am using pieces that are already attached to a bit of bark or rotten wood, and with live moss attached. My hope is that they will get back into spore production and spread more without further help from me.