palaeoethnomycology Q's

[Fred]

I am currently wanting to investigate the use of psychoactive fungi in archaic 
cultures.
Any opinions, leads, references, recipes greatly appreciated.
I am not another spaced-out hippy with my head in a cloud (of pot smoke),
I am trying to understand what has been taboo for a long long time in this 
culture, and eventually piece together what little research there is in this 
area.
Does Terence Mckenna ring any bells ?....

                    thanks 
                                   FRED
                                             xxx