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ECOLOGY Living Systems · Building 3 · AG Center · College III Bet which biome runs densest underground, then meet the real numbers — the fungal web is a river, not a vault — and finally the Blind Map: most of Earth’s soil has never been sampled.
🍄 OPATHORLOKAN UNIVERSITY
The Underground Map v0.2 · Living-Systems Suite · soil ecology · taught by Dr. Ravi Patel
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Ravi — “Everybody guesses the rainforest. Lush on top, must be rich below, right? Put your money down before you peel the soil — that’s the only honest way to meet a finding.”
Surface view — four biomes, lush to bare. The underground network is hidden. Which one runs densest below?

You can see what’s on top. You can’t see what’s underneath — nobody could, until 2026. Make your bet, lock it in, then peel the soil. Same trap the whole field walked into for a century: assuming the showy ecosystem is the rich one.

Commit your read

Before the soil comes off: which biome holds the densest fungal network underground?

Lester’s Method: pick the pattern before the data shows itself. Most people pick the rainforest.

The soil comes off

The rule you just built — lush on top means rich below — is backwards. Wild grasslands run about a third denser than tropical broadleaf forest and hold roughly 40% of the whole network’s mass. The soil we farm comes in about half as dense — the plow quietly thins the web that feeds the crop. You can’t read what’s underground off what’s on top.

A schematic of one real result, not a simulation. The biome scenes and thread densities are stylized for legibility; the ordering (grasslands densest, cropland thinnest) and the figures are the study’s, not measured here.

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Ravi — “Don’t picture a vault — picture a river. That 300 megatons isn’t just sitting there. Plants pump in about a billion tonnes of carbon a year to keep rebuilding it. The whole web turns over more than once a year. Watch it breathe.”

It’s a river, not a vault.

Carbon pours in from the plants up top, crosses the ground line, and feeds the network — which keeps tearing itself down and rebuilding. Drag the years.

110 quadrillion km
total thread, end to end — nearly a billion times Earth to the Sun
~300 ±60 Mt
living carbon held below right now — the standing stock
~1.3× / year
turnover — the whole network rebuilds about every 9 months
~1,000 Mt / yr
carbon plants pump in to keep it built (~a billion tonnes)
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Ravi — “Here’s the humbling part. This isn’t a map of the fungi — it’s a map of where we’ve looked. The dark places aren’t empty. They’re unread. Tap one.”

The Blind Map.

Schematic — coverage by region, not coastlines. Lit = the science exists here. Dark = nobody’s sampled it yet.

well sampled thin unmapped
Tap a region — the lit ones gave us almost all the data; the dark ones are blank.
~98%
of the samples came from English-language studies alone (4,056 of ~4,141)
4 of 11
languages searched actually returned usable data
100 of 846
of Earth’s terrestrial ecoregions have any data at all
9 of 14
global vegetated biomes represented — the rest are guesses

It’s not a translation problem — it’s a measurement gap

They did search all 11 languages (Dutch, Greek, Hindi, Korean, Russian…). The data just isn’t there — the field studies haven’t been done, or published, or indexed in most of the world. So a dark region doesn’t mean “no fungi.” It means no one has dug there yet.

Found data in your language or region? Here’s the real door.

OPA holds nothing and brokers nothing — this lab is just the bridge. The people who actually collect this are SPUN, and they exist to fill exactly these blanks:

· SPUN soil-sampling expeditions — a standard protocol, local collaborators worldwide.
· Underground Explorers — their grant program funding mycorrhizal research in under-explored regions (92 researchers, 43 countries and counting).
· The full dataset is open on Dryad — see exactly what’s been collected first.
· The lead author reads email: justin@spun.earth (Dr. Justin Stewart, SPUN).

How they actually saw it

A custom high-throughput imaging robot filmed the threads growing; widths came from 300,000+ measurements across 6 fungal species. They counted living hyphae only and IDed AM fungi by their aseptate threads (no cross-walls). The map is built from 322 studies and 16,669 soil cores, cross-validated biome-by-biome. “Living documents, not static images,” the authors say — the honesty is the model.

Pull the thread

🍄 Dr. Ravi “Mountain” Patelyour teacher — logged this map as his module #150,000 ⚖️ The Three Gauge Testthe method underneath: don’t trust the confident, showy answer — verify 🧹 Lester’s Methodwhere the citizen-scientist soil-sampling dream first showed up — the bridge idea, a year early

Schematic — coverage is illustrative (a map of effort, not exact coastlines), the headline figures are the study’s. Full sourcing: About & Sources.

Tab 1 of 3 — The bet