Skip to content
NatureHQ

phenomenon

How fungi coordinate

Fungal mycelium really does produce electrical spikes. The vocabulary of fifty words came from choosing where to cut the recording.

Fungi coordinate a great deal — chemically, by fusing their filaments into one connected body, and with electrical activity that has been recorded since the 1990s. What has not been shown is that any of it constitutes language, and the widely reported fungal vocabulary comes from a threshold chosen by an analyst.

A mycelium has a real coordination problem. It may cover several square metres, it has no brain, no nerves and no blood, and its far edges need to behave as parts of one organism — abandoning exhausted patches, thickening cords towards new food, fruiting all at once. It solves this, and the mechanisms are worth knowing: chemical signals diffusing through hyphae, hyphal fusion that turns separate filaments into a single connected network, and electrical activity that propagates and changes when the fungus is stimulated. Then there is the claim that arrived in 2022 and has not left, that fungi have a vocabulary of about fifty words. That claim rests on real recordings and on a step that is not a measurement: the spikes were grouped into trains wherever the gaps exceeded a threshold the analyst chose, and the resulting groups were compared with word lengths in human languages. No fungus was shown to respond to a train — no receiver was tested at all, which is the minimum a communication claim needs. This page separates what has been measured, which is genuinely interesting, from what has been said about it.

Developed record · 65% complete · reviewed 2026-08-30

What this page covers

Signalling and coordination within and between fungi: chemical signals, hyphal fusion, electrical activity and the interpretation of all three. Electrophysiological work covers only a handful of cultured species.

Often confused with: Mycorrhizal networks between plants

Quick facts

Electrical spiking
Recorded since the 1990s, and responds to stimulation
The "50 words"
A grouping threshold chosen by the analyst, not a measurement
Receiver tested?
No — no fungus has been shown to respond to a spike train
How a mycelium becomes one body
Hyphal fusion — separate filaments joining into a connected network

Where this appears

Assembled from the knowledge graph. Each entry carries its own evidence and its own limits.

Do fungi talk to each other?

The short answer, and the part the headlines removed.

The short answer

Do fungi have a language of about 50 words?

No — or at least, nothing has shown that they do. Fungi produce electrical spikes, and that is a real measurement. The words were produced by an analyst deciding how long a gap ends a word.

A 2022 study recorded voltage between electrode pairs in four fungal species, identified spikes, and grouped spikes into trains wherever the interval between them exceeded a chosen threshold. The resulting train lengths resembled the distribution of word lengths in several human languages, and that resemblance is where the vocabulary came from. Change the threshold and you get a different vocabulary. More decisively, nothing in the work tested a receiver: no fungus was shown to behave differently for having received a train, which is the minimum a communication claim requires. The paper itself says other explanations cannot be excluded; the coverage did not. What remains true and interesting is that fungal mycelium is electrically active, that the activity changes after a wound or a flame or contact with food, and that a mycelium does coordinate across metres without anything resembling a nervous system.

Check it for yourself

Fungi have not been shown to have words. The spikes are real; the vocabulary is an interpretation.

Popular claim, unsupported

Widely repeated, with no good evidence behind it.

The identification of word-like units in fungal electrical recordings depends on an analyst-chosen inter-spike interval threshold for grouping spikes into trains, and on a statistical similarity between train-length and word-length distributions. No experiment has demonstrated that any fungus alters its behaviour in response to a received spike train, which is the minimum requirement for a communication claim.

Who this applies to
Claims that fungal electrical spiking constitutes a language or vocabulary, as reported for four species.Do not extend this beyond the taxa listed — the popular version over-reaches.
Studied in
Basidiomycota, Ascomycota

You may have heard

“Fungi talk to each other using a vocabulary of about 50 words.”

The fifty comes from cutting a voltage recording into groups wherever the gaps exceed a threshold the analyst picked, then noting that the resulting group lengths resemble word lengths in English. Nothing in the work asks whether a fungus responds to a group, and until something does, the word "word" is doing all the work.

Why we rate it this way, and what the caveats are
Popular claim, unsupportedModerate confidence

The underlying recordings are sound and NatureHQ treats them as such. What is unsupported is the step to language, which rests on an analytical choice and an analogy rather than on a test — and the test that matters, whether a receiver responds, has not been run.

How far it can be extended

The analysis covers four species under laboratory conditions and tests no receiver.

Caveats

  • This is not a claim that fungi lack internal signalling. They plainly coordinate growth across a mycelium, by chemical and probably electrical means.
  • The original paper is more cautious than the coverage it generated.

Still unanswered

  • Whether a receiver experiment — delivering a recorded train to a fungus and measuring its response — would find anything.
  • What function, if any, the spike trains serve within the mycelium.

Last reviewed 2026-08-30

The evidence (2 studies)
Words used here
Spike train
A cluster of voltage spikes close together in time. Where one train ends and the next begins is a decision made when analysing the recording.

What the electrodes actually record

Fungal mycelium produces electrical spikes, and the pattern changes when the fungus is disturbed.

Well supported

Good evidence backs this, though some details remain open.

Electrode recordings from fungal mycelium and fruiting bodies show spontaneous voltage fluctuations resembling action potentials, arriving in irregular trains, whose rate and pattern alter following localised stimulation such as wounding, heat or contact with a food source.

Who this applies to
A small number of cultured species recorded under laboratory conditions with implanted electrodes.Do not extend this beyond the taxa listed — the popular version over-reaches.
Studied in
Basidiomycota, Ascomycota
Why we rate it this way, and what the caveats are
Well supportedModerate confidence

The phenomenon has been recorded independently since the 1990s and is not in doubt. Its scope is narrow — few species, laboratory conditions — and separating genuine biological activity from electrode artefact over long recordings is a persistent difficulty.

How far it can be extended

Recordings exist for only a handful of species, and electrode implantation is itself a wound, which is one of the stimuli that changes the signal.

Caveats

  • Activity within one mycelium is coordination within a single body, which is a different phenomenon from communication between individuals.
  • What the spikes do, if anything, is not established by their existence.

Still unanswered

  • Whether the spikes carry information, and if so what kind.
  • Whether any fungal behaviour changes in response to a spike train arriving from elsewhere.

Last reviewed 2026-08-30

The evidence (2 studies)

Diagram

The measurement, and the two columns it belongs in

Everything on the left is data. Everything on the right is what a language claim would require and does not have.

What the electrodes recordelectrodeelectrodemycelium, or a fruiting bodyVoltage spikes, arriving in trainsminutes to hoursmillivoltsDemonstratedVoltage fluctuations occur, without anystimulus. They cluster into trains, thetrains differ between species, and somechange after a flame, a wound or contactwith a piece of wood.Not shownThat a train carries meaning. That anyfungus responds to one. That thegroupings are units of anything at all.No receiver has been shown to behavedifferently for having received one.Cutting a signal into word-like units is a choice made by the analyst. It is not a finding about the fungus.
The same explanation in words

A two-part figure. On the left, a schematic of the experiment: a strand of mycelium or a fruiting body with two electrodes inserted at different points along it, wired to a recorder. To the right of that, a voltage trace against time, running over minutes to hours, showing a flat baseline interrupted by irregular clusters of sharp spikes a few millivolts high — the spike trains. Beneath, two boxes. The first, headed Demonstrated: voltage fluctuations occur without any stimulus; they cluster into trains; the trains differ between species; and some change after a flame, a wound, or contact with a piece of wood. The second, headed Not shown: that a train carries meaning; that any fungus responds to one; that the groupings are units of anything at all; and that no receiver has been shown to behave differently for having received one. A closing line states that cutting a signal into word-like units is a choice made by the analyst and is not a finding about the fungus.

How we know

Counting the gaps between fungal voltage spikes

Do the electrical spikes in fungal mycelium group into anything like words?

Pairs of electrodes were inserted into the mycelium or fruiting bodies of four fungal species and the voltage between them recorded for long periods. Spikes were identified in the traces. Spikes closer together than a chosen interval were treated as belonging to one train; a longer gap ended the train. The resulting train lengths were then compared statistically with the distribution of word lengths in several human languages.

What happened

Spikes did cluster into trains, and the distribution of train lengths resembled the distribution of word lengths in the languages compared. The author reported a median of around fifteen distinguishable groupings, and a possible repertoire of up to about fifty.

What it shows

Fungal mycelium produces voltage fluctuations that are not uniformly spaced but arrive in bursts, and the pattern of bursts differs between species. That much is a measurement.

What it does not show

It does not show that the trains mean anything. The word-like units exist because an analyst chose how long a gap ends a train, and a different threshold yields a different vocabulary; the resemblance between two length distributions is a statistical similarity, not evidence of shared function. Most importantly, no receiver was tested: nothing in this design asks whether any fungus, or anything else, behaves differently for having received a train. That test is the minimum a claim about language requires, and it has not been done.

The controls — what makes this evidence rather than a story
  • Four species were recorded rather than one, and their spike patterns differed from one another.
  • Reference recordings from the substrate were used to check that the signal came from the fungus.

From Language of fungi derived from their electrical spiking activity

It is worth saying what the honest interpretation of this activity probably is. A mycelium is one organism spread over a large area, and it has to act like one: cords thicken towards food, unproductive regions are abandoned and their material recovered, whole networks fruit at once. Electrical activity that propagates and responds to local events is exactly the sort of thing coordination inside a single body would use. That is a different phenomenon from communication between individuals, and the difference is not a technicality — it is the entire question.

Words used here
Action potential
A brief, self-propagating change in voltage across a membrane. In animals it is the basis of nerve signalling; fungal spikes resemble one without implying the rest.

The coordination that is not in dispute

Chemistry, fusion and growth — how a mycelium behaves as one organism.

The best-established fungal signalling is chemical, and some of it is unusually well characterised. Fungi with mating types recognise a compatible partner by peptide pheromones and matching receptors, and will grow towards one; the recognition is specific enough that a mismatch produces no response at all. Fungi also sense their own density and their neighbours through diffusible compounds, and adjust growth, sporulation and enzyme production accordingly.

The clearest case of fungal chemical signalling, and it is a recognition system rather than a message: a hypha grows towards a partner whose pheromone its own receptors can read, and ignores one whose it cannot.

Many fungi have thousands of mating types rather than two sexes

Established

Specialists would state this without hedging. Multiple independent lines of evidence agree.

Sexual compatibility in many basidiomycetes is governed by two unlinked mating-type loci, each with many alleles. Two mycelia can mate if they differ at both loci, which in species such as Coprinopsis cinerea and Schizophyllum commune produces thousands of mutually compatible mating types rather than two sexes. Compatible hyphae fuse, and the resulting mycelium carries two genetically distinct nuclei side by side without fusing them.

Who this applies to
tetrapolar basidiomycetes; other fungal groups differ
Studied in
Basidiomycota, Coprinopsis cinerea

You may have heard

“Fungi have thousands of sexes”

A good headline resting on the wrong word. Sexes imply different gametes — large eggs and small sperm — and these fungi have neither. What they have is a compatibility system with many alleles, so almost any two individuals can pair. Calling them sexes makes a genuinely unfamiliar arrangement sound like a familiar one multiplied.

Why we rate it this way, and what the caveats are
EstablishedHigh confidence

The loci have been characterised genetically and the compatibility predictions tested by crossing isolates.

How far it can be extended

Multi-allelic mating-type systems are widespread among basidiomycetes. Many ascomycetes and other fungi have simpler bipolar systems, and some are asexual.

Caveats

  • Not all fungi work this way: bipolar systems with two mating types are common, and many fungi reproduce asexually.
  • Mating type is not sex — there are no distinguishable male and female structures in these species.
  • The genetics is best characterised in a small number of laboratory species.

Still unanswered

  • What maintains such high allele diversity at the mating-type loci?

Last reviewed 2026-08-11

The evidence (1 study)

The reason coordination is a problem worth solving in the first place. The organism is the network, and the network is large.

A mushroom is a fruiting body — the fungus itself is a network in the soil or wood

Established

Specialists would state this without hedging. Multiple independent lines of evidence agree.

The vegetative body of most fungi is a mycelium of hyphae permeating its substrate. Fruiting bodies are transient reproductive structures. Individual mycelial genets can occupy many hectares and persist for centuries, as established by genetic identification of isolates across a forest.

Who this applies to
fungi generally; the size record established in Armillaria
Studied in
Fungi, Armillaria gallica

You may have heard

“The biggest living thing in the world is a fungus in Oregon”

Broadly right and worth qualifying. "Biggest" depends on whether you count area, mass or connectedness; the mass is estimated rather than weighed; and whether one genetically uniform mycelium is one organism is a choice about definitions rather than a discovery about nature.

Why we rate it this way, and what the caveats are
EstablishedHigh confidence

Basic mycology, supported by genetic delimitation of individual genets across landscapes. The extent of a single individual is the part that involves estimation.

How far it can be extended

Mycelial organisation is fundamental to the kingdom outside the single-celled yeasts, and large genets have been identified in several genera independently.

Caveats

  • Mass and age figures for large genets are extrapolations, not measurements.
  • Whether a spatially continuous genet counts as one individual is a definitional question.
  • Yeasts are fungi and are not mycelial, so the picture does not cover the whole kingdom.

Still unanswered

  • How old can a fungal individual actually get?
  • How much of a large genet remains physically connected rather than fragmented?

Last reviewed 2026-08-09

The evidence (2 studies)
  • Hyphal fusion — anastomosis — joins separate filaments so that a mycelium becomes one continuous, interconnected network rather than a set of parallel threads. It is the physical basis of everything else here.
  • Nutrients and signals then move through that network, so a discovery at one edge can change behaviour at another.
  • Cord-forming fungi thicken the connections towards a resource and withdraw material from unproductive regions — foraging, by an organism with no ability to move.
  • Where two different individuals meet, the response is usually combat rather than cooperation: visible dark barrier lines in decaying wood are the boundary between two fungi neither of which is winning.
  • Fungi respond to damage, to light, to gravity and to the chemistry of the substrate, and adjust where they grow and when they fruit.

The same machinery, put to different uses

  • Mycorrhizal networks

    What moves between plants along fungal connections, and what does not

  • Mushrooms

    The fruiting body, and what has to be coordinated to build one

Words used here
Anastomosis
The fusion of two hyphae into a continuous connection. It is what turns a mass of filaments into a single connected organism.
Hypha
A single fungal filament, typically a few micrometres across. A mycelium is a network of them.

Signalling into another organism

The fungus that makes an ant climb and bite does not invade its brain. It fills the muscles and leaves the brain alone.

Well supported

Good evidence backs this, though some details remain open.

Three-dimensional reconstruction of Camponotus castaneus infected with Ophiocordyceps unilateralis found fungal cells forming an interconnected network throughout the body cavity and surrounding and penetrating muscle fibres, including mandibular muscle, with the brain conspicuously free of fungal cells.

Who this applies to
One fungus and one ant host, in laboratory infections.
Studied in
Ophiocordyceps unilateralis, Camponotus castaneus

You may have heard

“The zombie-ant fungus takes over the ant’s brain.”

It leaves the brain untouched and takes the muscles instead — which is stranger. The ant’s nervous system is intact while its body is carried somewhere it did not choose.

Why we rate it this way, and what the caveats are
Well supportedModerate confidence

A careful anatomical reconstruction with a clear and unexpected result, but a single host–parasite pair and a description of location rather than of mechanism.

Caveats

  • Other manipulating fungi work differently; this establishes nothing about fungal manipulation in general.
  • Where the fungus is does not establish the chemistry by which the behaviour changes.

Still unanswered

  • Which compounds produced by the fungus act on the host, and where they act.

Last reviewed 2026-08-30

The evidence (1 study)

The most dramatic fungal effects on other organisms are chemical rather than electrical, and the best-studied case turns out to work differently from its reputation. Ophiocordyceps infects an ant, changes where it goes and makes it bite down on vegetation before it dies — and a three-dimensional reconstruction of an infected ant found fungal cells filling the body and wrapped around the muscles, with the brain conspicuously untouched. The nervous system is intact; the body is no longer taking instructions from it.

This is worth scoping carefully, because it is the fungal fact most likely to be over-extended. It is a specialised relationship between particular fungi and particular insects, refined over a long evolutionary history, and it establishes nothing whatever about fungi influencing anything larger.

What would actually settle this

  • Does any fungus respond to a spike train arriving from elsewhere?

    Why it matters: This is the missing experiment. Until a receiver is shown to behave differently, electrical activity remains a property of the organism rather than a message between organisms.

    What would settle it: Delivering a recorded or synthesised train to a mycelium and measuring growth, enzyme production or fruiting against a control receiving a scrambled version.

  • What function, if any, does the spiking serve inside the mycelium?

    Why it matters: Coordination across a large body is a real problem that fungi demonstrably solve. Whether electrical activity is part of the solution, a by-product of transport, or something else is unknown.

  • How much of the recorded activity survives better electrode methods?

    Why it matters: Inserting an electrode is a wound, and wounding changes the signal. Long recordings also drift. Separating biology from artefact is the first problem in this field.

Claims about this, checked

Things people have heard, and what the evidence actually supports.

The research behind this page

6 studies, newest first. Each one has a page explaining what it found and what it could not show.

Where to go from here

Each of these follows from something on this page — a relationship in the evidence, a claim people ask about, or the next mechanism along.

How complete this record is, and what it is still missing

NatureHQ publishes its own gaps. This record is at 65% completeness against what we would call a finished subject, and was last reviewed on 2026-08-30. It carries 5 claims and answers 4 mapped search questions.

  • more experiments could be explained in plain English
  • Quorum sensing is well characterised in bacteria and much less so in fungi; the page says little about how far the analogy holds.
  • Volatile compounds released by fungi into the air, and their effects on insects and plants, are barely covered.
  • Fungal responses to light and gravity are mentioned in passing and would support a section.