Half of what science claims about fungal networks is wrong. The corrected version is a better blueprint for multi-agent AI than the fairy tale ever was. Introduction In 2024, Yu Fukasawa arranged wood blocks in geometric patterns on the floor of his lab at Tohoku University and seeded them with fungal spores. He wasn't building anything. He was watching. Over the following weeks, the mycelium didn't spread uniformly across the available space the way a simple growth model would predict. It reached toward specific blocks, prioritized certain connections, and ignored others. "They have memories, they learn, and they make decisions," Fukasawa told reporters. "It's not human intelligence, but it's intelligence nonetheless." A brainless organism, solving a routing problem. No central planner. No objective function. Just a network making choices. If you build multi-agent AI systems, that description should sound familiar.…