I wasn’t familiar with this Moebius story, but it’s pretty typical fare from him. After a few pages of wandering about, the main character encounters a sentient mushroom and bites off a piece. Of course the mushroom is hallucinogenic and we end the story with this page of weirdness. I love the spiral in the place of the main character’s head in the bottom left corner of the page.
(Heavy Metal issue #73, April 1983 - Page 89 The Twinkle in Fildegar’s Eye by Moebius)