The strongest??? Really? The only psychedelic shrooms that grow in Aus are Subs, Cubensis (QLD?) and Cyanensis (and fly agaric if you count those) as far as i am aware. Not sure where Cyanensis grow though. Tell me if I am wrong.
I was in Canberra for about 1.5 years and perhaps i was unlucky but it seriously hardly rained at all in that time, and all the spots, all over and around Canberra, where i hunted were dry and dusty - not good for any kind of fungus. But on advice I drove to a town about 1.5 hrs from Canberra though and hit the jackpot!! It was towards the coast in a much more fertile environment. And it was Subs that were growing, in pine needles, and for whatever reason they also happened to be REALLY big, twice the size of anything i've picked in Victoria.
Also my understanding is that the Cubensis are only up north, QLD and are not native to Australia. They are a dung loving species from memory.
We Victorians are lucky i guess, the things just EXPLODE for that one month or so, you just can't go anywhere and not see them!!
I don't even really like taking mushrooms, i just love looking for them and the thrill of finding them.
WC