Hypha
One microscopic fungal filament. Hyphae extend at their tips, branch, merge, and interact with whatever they grow through.
FIELD NOTES / 001
The real world
is already wild.
Mushrooms are only the visible moment. The larger organism is usually hidden: branching hyphae form mycelium through soil, wood, roots, and living tissue.
These networks trade, forage, digest, defend, rebuild, and reproduce. They do not think like animals or behave like fantasy magic. The actual biology is stranger—and it became the foundation of the game.
BEFORE WE GO UNDERGROUND
Mushroom ≠ fungus.
Mycelium
The connected body formed by many hyphae. It can spread invisibly through a substrate while gathering and redistributing resources.
Mushroom
A fruiting body built to produce and release spores. It is closer to an apple on a tree than the whole organism.
NINE REAL ABILITIESNot superpowers.
Not superpowers.
Biology.
Each ability below is documented in real fungi. What varies—sometimes dramatically—is the species, environment, scale, and strength of the effect.
01
SYMBIOSIS / RESOURCE TRADE
They trade with plants.
Mycorrhizal fungi associate with plant roots. Plants supply carbon made through photosynthesis; fungi can deliver mineral nutrients and water gathered beyond the root’s immediate reach. Experiments now show that resource exchange can move in pulses through fungal networks rather than as a simple continuous flow.1
02
TRANSPORT / LOGISTICS
They move resources through themselves.
A mycelium is not just a collection of disconnected threads. Materials can be transported across the network toward active growth, reproduction, or demanding regions. Where a route exists matters.
03
DECOMPOSITION / NUTRIENT CYCLING
They unlock dead wood.
Wood-decay fungi deploy specialized enzymes and chemistry against cellulose, hemicellulose, and lignin—the stubborn structural material that makes wood woody. By dismantling dead tissue, fungi return locked nutrients to the ecosystem and profoundly influence forest carbon cycling.2
04
ENGINEERING / SOIL
They alter the ground around them.
Hyphae bind particles, interact with pores, and can change how water moves through soil. Controlled experiments found that one arbuscular mycorrhizal fungus altered water retention and hydraulic conductivity differently in sand and loam—a reminder that fungal effects depend on the ground itself.3
05
PREDATION / CHEMICAL WARFARE
Some mushrooms hunt.
Oyster mushrooms are nematode predators. Their mycelium can immobilize tiny worms and use them as a nutrient source. Other fungi build adhesive nets, constricting rings, or chemical traps. The peaceful-looking forest floor contains real microscopic conflict.4
06
IDENTITY / FUSION
They recognize self from stranger.
Compatible fungal hyphae can fuse and share cytoplasm. Incompatible individuals may trigger programmed cell death at the meeting point, walling off the encounter. Fungi have molecular systems for cooperation, individuality, and rejection without brains or immune systems like ours.5
07
DISPERSAL / REPRODUCTION
They travel by air, water, and animal.
Fungal spores ride turbulent air, splash in rain, cling to bodies, and pass through animals. A forest study found wind and small mammals carried different fungal communities, making the two routes complementary rather than redundant.6
08
BIOLUMINESCENCE / CHEMISTRY
Some fungi make their own light.
Dozens of mushroom-forming fungi glow through a luciferin–luciferase chemical system. Depending on the species, the light may appear in the mushroom, the mycelium, or both. Why it evolved may not have one universal answer.7
09
BIOREMEDIATION / METABOLISM
They can break down serious pollutants.
Some fungi and fungal enzymes can transform petroleum hydrocarbons, dyes, pesticides, and other stubborn organic compounds. Laboratory results are promising, but field performance is species- and site-specific; fungi are not a magic cleanup powder.8
MYTH CHECK
The forest internet?
Common mycorrhizal networks really can connect plants, and experiments have measured movement of resources or signals through fungal pathways. That does not prove trees consciously communicate, mother trees intentionally care for offspring, or every forest operates as one cooperative internet.
A 2023 review found that several popular claims outran the available evidence and were amplified through citation bias.9 TMU takes inspiration from real connection and exchange—not the claim that fungi are secretly tiny fiber-optic cables with opinions.
The game does not paste fantasy onto fungi.
The fungi supply the fantasy.
TMU compresses biological processes into readable choices: months become turns, hyphal exchange becomes logistics, chemical competition becomes tactical conflict, and ecological relationships become diplomacy. The rules are designed for a game—but the reason those rules exist begins underground.
EXPLORE THE GAME →- A travelling-wave strategy for plant–fungal trade — Nature, 2025.
- Metabolic potential of fungi for lignin turnover in deadwood — Nature Ecology & Evolution, 2025.
- An arbuscular mycorrhizal fungus alters soil water retention and hydraulic conductivity — Mycorrhiza, 2023.
- The toxin produced by Pleurotus ostreatus reduces the head size of nematodes — Biological & Pharmaceutical Bulletin, 2008.
- Molecular mechanisms regulating cell fusion and heterokaryon formation — Microbiology Spectrum, 2017.
- Wind and small mammals are complementary fungal dispersers — Ecology, 2023.
- Two forms of substrate for the bioluminescent reaction in basidiomycetes — Scientific Reports, 2019.
- Fungi in global hydrocarbon bioremediation — Critical Reviews in Biotechnology, 2026.
- Positive citation bias and overinterpreted results in common mycorrhizal networks — Nature Ecology & Evolution, 2023.