The Mysterious Realm of Mushrooms [Part 1]
Puffballs
Mycena chlorophos
Marasmius haematocephalus
Rhodotus palmatus
Phallus indusiatus
Schizophyllum commune
Amethyst deceiver
Panus fasciatus
Clathrus ruber
Porcelain fungus
Cup fungus
Lepiota
Leratiomyces
Hydnellum peckii
Favolaschia calocera
There's some pretty interesting theories about mushrooms actually originally arriving to this planet from outer space; their spores can survive in space.
They certainly look alien :)
Also there is Terence McKenna who theorised that humans only evolved so far through the use of magic mushrooms.