Amanita Pestilens is a 1963 Canadian-American psychological horror-fantasy/drama film produced by F. R. Crawley, and directed by René Bonnière.
The film's script was written by Canadian author David Walker and was initially titled Staircases.
[3] The plot concerns a Montreal suburbanite who becomes obsessed with his award-winning lawn, which has become infested with a ground fungus.
The mushrooms prove impossible to eradicate, and the homeowner directs all his efforts to getting rid of them, to the exclusion of all else.
Amanita Pestilens was the second Canadian colour film, after Étienne Brûlé gibier de potence/The Immortal Scoundrel from 1952, shot in English and French.