SkiNLaB said:
god damn, so much for having a national park behind my house, its useless then!
hehe im in the same boat, i've spent plenty of time looking around sydney, and it's tough. that's not to say you wont be successful, but it's hard! take a drive out to the blue mountains if possible. woodchip beds. that is all
as for lookalikes, yes i've seen p. sub lookalikes ... there are simple ways to ID them, however. pretty much every sub will bruise blue DEEPLY... bruise the gills or scratch the stem and wait a few minutes or more. almost all the sub's i found already had hints of blue bruising, perhaps on small bits of damage made to the cap from the environment, generally plenty on the stem and around the edges of the gills as well.
the gills should be tan to brown, tho they vary in colour so this isn't a definite way to ID. gills are also generally crowded, altho p. eucalypta (possibly a variant of subaeruginosa, but which also seems quite rare) has fairly distant gills.
if you're unsure then it probably isn't a sub! if you have blue bruising, and it looks right but u still want to be sure, make a spore print. cut off the stem close to the gills from a fresh mushroom, place it gills down on a blank piece of paper and leave it overnight... the spores should collect on the piece of paper. if the spores are a chocolatey brown, it bruises blue and is macroscopically the same as a p.sub, then it is a psilocybe.
also, with drying, i've read and been told from many sources that the cheapest and most appropriate way to dry is - fan dry for 24 hours, then place in a container with damprid until cracker dry... this should only take a few days

if you have a food dehydrator, then this may work also. don't use heat! make sure that they are cracker dry!
cheers,
jimbu