Cordyceps

Cordyceps is a parasitic fungus whose relationship with ants gives it a striking place in the book: it is at once an organism with a specific method of reproduction, a means of controlling an infestation, and an image through which Paul Stamets’s devotion to fungi is understood. Its effects on an ant colony are not merely destructive. The fungus changes the ant’s behavior in ways that help spread its spores, while Stamets adapts that biological strategy to overcome the defenses of an infestation at his home. The resulting patent connects the fungus’s life cycle to a practical outcome in Stamets’s own life.

Biological strategy

The book describes Cordyceps as a fungus that can colonize carpenter ants after they eat it. Before the fungus kills its host, it chemically induces the ant to climb to the highest point in its surroundings. A mushroom then grows from the ant’s head and releases spores into the wind. The sequence links the host’s movement to the fungus’s reproduction: the ant is made to occupy a position that helps disperse the next generation. The passage presents this as a biological process, not as a conscious choice by the fungus.

That process makes Cordyceps more than a cause of ant mortality in the book’s account. Its life cycle reaches into the ant’s behavior and uses that behavior to support spore dispersal. The fungus’s effects therefore appear coordinated even though they are described in terms of colonization, chemical influence, growth, and release. For Stamets, whose work centers on fungi and their capacities, this example makes vivid how fungal activity can shape relations among organisms.

The infestation and the fungus’s countermeasure

When Stamets moved into the old farmhouse on the site of his later home, carpenter ants were gradually damaging the building. He knew which Cordyceps species could destroy an ant colony, but the ants had a defense against it: they inspected returning members, removed the heads of ants bearing Cordyceps spores, and discarded their bodies away from the colony. Simply introducing the fungus in its ordinary form would not reliably overcome this behavior.

Stamets responded by breeding a mutant Cordyceps-like fungus that postponed sporulation. The delay mattered because the ants could carry the mycelium into their nest before it began producing spores. Stamets put some of the mycelium in a bowl in his daughter’s dollhouse and left it on the kitchen floor. During the night, ants carried it into the colony, apparently treating it as a food source that posed no immediate danger. By the time the fungus sporulated, it was already inside the nest. It then colonized the ants and produced fruiting bodies from their heads, eliminating the colony.

The episode turns on timing and on the gap between the ants’ defense and the fungus’s delayed development. The ants’ inspection behavior had been effective against spores on returning ants; Stamets’s intervention changed when the fungus produced them. In that sense, the solution did not simply deploy Cordyceps against the colony. It used an altered fungal life cycle to pass through the colony’s existing defenses and take effect from within.

Patent, house, and practical consequence

The fungus could not save the farmhouse, which had already succumbed to the infestation. Stamets nevertheless received a patent for the mycopesticide, and proceeds from its sale enabled him to build a much grander house on the site at Little Skookum Inlet. The home thus carries a practical history: its construction followed the loss of the old building and was funded, in part, by a patented fungal response to the ants that had damaged it.

The book’s description of the house as one that mushrooms built links Stamets’s domestic life to his work without making the fungus a decorative emblem alone. The sequence has material consequences: an infestation prompts an experiment, the experiment yields a patent, and the patent helps finance a new home. Cordyceps is part of that chain as both the organism whose life cycle Stamets understood and the basis for a modified approach that could succeed where the unaltered fungus might not.

Stamets and the fungal analogy

The narrator reports seeing Stamets show a video of Cordyceps affecting an ant more than once. The repeated viewing prompted a comparison between the ant and Stamets: the fungus takes over the ant’s body and redirects its behavior, while fungi have, in a figurative sense, taken over Stamets’s attention and life. The comparison is explicitly limited. Fungi have not killed Stamets, and his knowledge of their capacities distinguishes his situation from that of the ant. What the analogy draws together is biological influence and human devotion, not a claim that the two processes are identical.

In the narrator’s account, Stamets speaks for mushrooms and helps extend their reach through mail order and the force of his enthusiasm. The ant carries the fungus into a colony; Stamets carries fungal ideas and materials outward among people. Set beside one another, the processes differ sharply in agency and consequence, yet both involve movement beyond an initial point of contact. Cordyceps consequently becomes a measure of the scale of Stamets’s commitment: the fungus’s intimate control of an ant provides an unsettling counter-image for a man who has devoted himself to understanding and disseminating fungi.