In my study, I interpret one of the most outstanding stories of Hungarian fiction, László Sepsi’s weird, body- and biohorror novel, Fruiting Bodies [Termőtestek]. The narrative depicts the rivalry between gangster families who fight for the hallucinogenic mushrooms, an important commodity in their town Höksring. As the novel progresses, the rivalry of the crime families fades into the background against the disease spread by the mushrooms, and thus the story presents the beginning of an eco-dystopia and apocalypse. As the title suggests, one of the central motifs of the text is the mushroom, which is both a drug (essentially food) and the basis of the city and houses (living space). In this paper, I will show how the metaphors and similes in the narrative, through the compared things, represent the blurred boundaries between the human body, nature, disease, food and the city, which are central to the novel’s narrative. In my view, the narrative and the parts of the story that focus on the relationship between humans and environment/nature are themed around the breakdown of binary oppositions. The boundaries between culturally distinct categories, the Great Divide (to use Bruno Latour’s term), are dissolved, and the ecological viewpoint, the circulation of matter and reciprocity predominate. I will show that Fruiting Bodies dismantles hierarchies at the narrative level of both the action and the storytelling, offering a more universal perspective rather than a purely anthropocentric one, by situating humanity in the relationships of natural cycles. I will build on the main terms of plant studies (such as plant blindness and plant will), and through the concepts of phytosemiology, Object-Oriented Ontology, flat ontology, hyperobject and dark ecology, I will show how the fungus as metaphor and motif organizes the narrative, and thus offers a posthuman perspective instead of an anthropocentric one.