At its worst, Fantastic Fungi gets too woo-woo wacky for its own good (when the film’s discussion turns to magic mushrooms, the visuals turn into what is, as far as I can tell, just a psychedelic screensaver from Windows 95), but at its best, the doc pairs fantastic time-lapse imagery with a good dose of actual, mind-blowing science. Affable, passionate mushroom researcher Paul Stamets is joined by talking heads Michael Pollan, Andrew Weil, and narrator Brie Larson to examine everything from massive fungal networks that carry signals between disparate, distant plants to the psychological benefits of psilocybin. It’s an uneven trip, but a good one.