Philadelphia isn’t just slinging cheesesteaks anymore—it’s slinging spores. With mushroom food and beverage sales up 450% since 2021, functional fungi are taking over the city’s plates, drinks, and snacks. From Kennett Square’s global dominance to Philly’s own Mycopolitan basement farm, the mushroom revolution is both urban and cosmic. And this September, a festival of fungi is bringing the city together under one canopy of caps.