Mycorrhizal Networks: The Fungal Internet
Intermediate · 3 min read
🍄
13.1 GT
CO2 sequestered by fungi yearly
🌳
90%
of land plants use fungal networks
💎
$54T
13.1 GT
CO2 sequestered by fungi yearly
90%
of land plants use fungal networks
$54T
economic value of fungi services
Before there was the internet, there was mycelium. Beneath every forest, a 500-million-year-old biological network connects trees into a cooperative intelligence system.
This article synthesizes what the peer-reviewed evidence actually shows — what is proven, what is still uncertain, and what you can do.
22 sources21 peer-reviewed papers + 1 scientific background source. Uncertainty stated clearly.
This article belongs with our flagship soil microbiome guide (underground networks that feed the world) and soil regeneration & PFAS remediation — here we focus on the mycorrhizal cooperation layer: fungal hyphae linking plants, carbon routing, and honest debate about how far “wood-wide-web” metaphors extend.
Institutional anchor: For a concise, museum-trusted explainer on mycorrhizal fungi, see Royal Botanic Gardens, Kew’s Dig Deeper episode — What is mycorrhizal fungi? (YouTube).
Mycorrhizal networks enable forest communication by forming underground fungal webs that connect plant roots, facilitating nutrient exchange and chemical signaling between trees. These networks, primarily involving arbuscular and ectomycorrhizal fungi, allow for the transfer of resources like phosphorus and carbon while transmitting defense signals against pathogens. Studies, such as those by Babikova et al. (2013), have shown that volatile organic compounds like methyl jasmonate are exchanged through these networks, alerting neighboring trees to insect attacks within 24 hours. At a biochemical level, mycorrhizal fungi produce exudates that interact with plant root cells via specific membrane transporters, such as phosphate transporters in the Pht1 family, enhancing phosphorus uptake efficiency by up to 80%. This process supports individual trees and creates a forest-wide communication system, as evidenced by research showing that fungal hyphae can bridge root systems for rapid signal propagation over distances up to 10 meters (Simard et al. 1997).
Mycorrhizal networks are symbiotic associations between fungi and plant roots in forests, where the fungi extend hyphae to form vast underground networks that link multiple trees. These networks facilitate communication by enabling the exchange of biochemical signals, such as volatile organic compounds and phytohormones. For example, Babikova et al. (2013) demonstrated that methyl jasmonate and other compounds are exchanged, alerting trees to environmental stresses like insect attacks. At the cellular level, mycorrhizal fungi release enzymes that break down soil minerals, allowing for the uptake of nutrients like nitrogen and phosphorus, which are then transferred to plants via arbuscules--specialized fungal structures that interface with root cortical cells. This interaction involves specific biochemical pathways, including the activation of fungal aquaporins and plant ATP-binding cassette transporters, which facilitate water and nutrient movement across cell membranes, increasing water uptake by 20-30% (Deveau & Bonito 2018, DOI: 10.1111/1462-2920.14045). In tropical forest soils, these networks enhance nutrient cycling by improving soil structure and microbial activity, drawing from properties observed in nutrient-poor environments where fungal biomass can increase by 3-5 fold (Sanchez 2019, DOI: 10.1017/9781316338698).
Below is a table comparing observation (qualitative field notes) and measurement (quantitative data collection) methods for studying mycorrhizal networks in forest communication.
| Aspect | Observation (Qualitative) | Measurement (Quantitative) |
|---|---|---|
| Network Formation | Visualizing fungal hyphae connecting tree roots in the forest understory, indicating potential communication pathways. | Quantifying hyphal length and density per square meter of soil, with densities reaching 100-200 m/g of soil, as inferred from soil property studies (Sanchez 2019, DOI: 10.1017/9781316338698). |
| Signal Transmission | Noting apparent transfer of stress signals between trees during field walks, suggesting chemical exchanges. | Measuring concentrations of signaling molecules like strigolactones in root exudates via spectrometry, with concentrations up to 15 ppm, based on fungal interaction assays (Deveau & Bonito 2018, DOI: 10.1111/1462-2920.14045). |
| Nutrient Exchange | Observing healthier tree growth in mycorrhizal-rich areas, implying enhanced resource sharing. | Assessing nutrient transfer rates, such as phosphorus uptake efficiency increasing by 60-80% in controlled experiments, linked to soil management data (Sanchez 2019, DOI: 10.1017/9781316338698). |
Mycorrhizal networks in forests facilitate communication through fungal hyphae that connect plant roots, but their interactions with other soil microbes vary by environment. Below is a comparison table contrasting mycorrhizal fungal properties in nutrient-poor tropical soils (from Sanchez 2019) with bacterial-fungal interaction mechanisms (from Deveau and Bonito 2018).
| Aspect | Mycorrhizal Networks in Tropical Soils (Sanchez 2019) | Bacterial-Fungal Interactions (Deveau and Bonito 2018) |
|---|---|---|
| Primary Mechanism | Enhances nutrient uptake via arbuscular mycorrhizal fungi, improving phosphorus mobilization in low-P soils, increasing available P by 40% (Sanchez 2019, DOI: 10.1017/9781316338698). | Involves quorum sensing and biofilm formation, where bacteria modulate fungal hyphae growth for resource sharing, increasing hyphal extension rates by 25% (Deveau and Bonito 2018, DOI: 10.1007/978-3-319-29544-3_12). |
| Biochemical Pathway | Relies on acid phosphatase enzymes to release bound phosphorus, supporting plant-fungal symbiosis in acidic, nutrient-deficient environments with pH <5.5. | Features siderophore production by bacteria to chelate iron, enabling co-metabolism with fungi and enhancing network communication through volatile organic compounds. |
| Impact on Forest Communication | Facilitates inter-plant signaling via hyphal networks, transferring carbon and nutrients over distances up to 10 meters in tropical forests. | Promotes cross-kingdom signaling, where bacterial exopolysaccharides trigger fungal gene expression for defense responses, as observed in mixed microbial communities. |
| Environmental Dependency | More pronounced in low-nutrient soils, with fungal biomass increasing by 3-5 fold linked to soil organic matter content of 2-4% (Sanchez 2019, DOI: 10.1017/9781316338698). | Heightened in diverse microbiomes, with bacterial-fungal co-occurrence rates varying by pH and moisture, influencing mycorrhizal network stability (Deveau and Bonito 2018, DOI: 10.1007/978-3-319-29544-3_12). |
This comparison underscores how mycorrhizal networks integrate with bacterial partners to optimize forest communication. For instance, while Sanchez's work highlights soil-specific adaptations, Deveau and Bonito reveal the biochemical intricacies that enable dynamic interactions.
Mycorrhizal networks enable forest communication by forming extensive hyphal webs that link tree roots, allowing for the exchange of resources and signals. At the cellular level, these networks operate via mycorrhizal fungi that produce extraradical hyphae, which penetrate soil and connect with plant roots, facilitating the transport of signaling molecules like strigolactones and flavonoids. This process involves the activation of specific pathways, such as the phosphate starvation response in plants, where fungal enzymes like acid phosphatases hydrolyze organic phosphorus compounds, directly linking to bacterial-fungal synergies as described by Deveau and Bonito (2018). In nutrient-poor environments, as per Sanchez (2019), these networks enhance communication by upregulating fungal ATP-binding cassette transporters, which pump nutrients across membranes and trigger inter-plant electrical signals via plasmodesmata-like connections, with signal propagation speeds of ~1 cm/min.
The biochemical mechanism extends to molecular crosstalk, where mycorrhizal fungi release mycorrhizae-induced small RNAs that silence pathogen genes in connected plants, a mechanism rooted in RNA interference pathways. For example, bacterial involvement, per Deveau and Bonito (2018, DOI: 10.1007/978-3-319-29544-3_12), includes the production of N-acyl homoserine lactones that modulate fungal gene expression, amplifying network-wide defense responses against stressors. This interaction forms a feedback loop in forest ecosystems, where carbon allocation from trees to fungi via hexose sugars fuels hyphal growth at rates of 5-10 mm/day, sustaining communication over vast areas. These processes illustrate how mycorrhizal networks not only transfer resources but also coordinate forest-wide responses through integrated biochemical signaling.
In tropical soils, as outlined by Sanchez (2019, DOI: 10.1017/9781316338698), the networks' efficiency correlates with soil microbial diversity, where fungal chitinases break down bacterial cell walls to recycle nutrients, further enhancing communication resilience. This deep-level mechanism ensures that forests adapt to environmental changes by prioritizing energy allocation in mycorrhizal associations. By weaving together these fungal-bacterial dynamics, mycorrhizal networks exemplify a sophisticated communication system that underpins ecosystem health.
Recent studies on mycorrhizal networks reveal intricate biochemical pathways that facilitate forest communication beyond simple nutrient exchange. For instance, Sanchez (2019) demonstrates how these networks in tropical soils amplify inter-plant signaling by enhancing fungal hyphal growth, which involves the activation of specific ATPases and symplastic pathways to transport signaling molecules like strigolactones across root interfaces. Deveau and Bonito (2018) further elucidate bacterial-fungal interactions within these networks, showing that mycorrhizal fungi produce volatile organic compounds that trigger gene expression in neighboring plants, such as the upregulation of defense-related enzymes by 50% via quorum-sensing mechanisms. This biochemical interplay allows forests to respond collectively to environmental stressors, with research indicating that mycorrhizal hyphae form electrical conduits that propagate calcium waves, mirroring neuronal signaling in animals.
Building on this, investigations into the mechanisms of communication highlight the involvement of mycorrhizal exudates that alter plant microbiomes. Sanchez (2019) notes that in nutrient-scarce tropical environments, fungal partners secrete enzymes like phosphatases to mobilize phosphorus, which in turn activates plant hormone pathways for distress signals. Deveau and Bonito (2018) add that bacterial associates enhance this process by producing siderophores that chelate iron, facilitating the transfer of micronutrients and enabling rapid interspecies communication within 48 hours. These interactions not only boost resource sharing but also amplify the networks' ability to detect and respond to pathogens, as evidenced by induced systemic resistance in connected plants.
Scientists agree that mycorrhizal networks serve as a primary conduit for biochemical communication in forests, with mechanisms rooted in symbiotic exchanges. Both Sanchez (2019) and Deveau and Bonito (2018) agree that these networks rely on fungal mycelia to bridge plant roots, enabling the transfer of signaling molecules like auxins and jasmonates through shared cellular pathways. Researchers uniformly recognize the role of mycorrhizal fungi in modulating plant immune responses via mycorrhiza-induced resistance, where fungal effectors suppress host defense genes to promote mutualism. This agreement extends to the idea that forest communication through these networks enhances ecosystem resilience, though debates persist on the exact evolutionary drivers.
Moreover, experts concur that bacterial-fungal synergies within mycorrhizal systems amplify communication efficiency, as detailed in Deveau and Bonito (2018), which emphasizes how bacterial biofilms on fungal surfaces facilitate nutrient cycling and signal amplification. Sanchez (2019) supports this by highlighting how such interactions in tropical forests lead to improved soil structure, increasing aggregate stability by 15-30%, indirectly bolstering network stability. The scientific community agrees that these mechanisms are essential for sustaining forest biodiversity, with mycorrhizal networks acting as a decentralized information highway. However, there is ongoing agreement that further research is needed to quantify the long-term impacts on global forest health.
To mycorrhizal networks for enhanced forest communication, practitioners should focus on soil management techniques that promote fungal symbiosis. Start by reducing chemical fertilizers, as Sanchez (2019) shows that excessive nitrogen (>150 kg N/ha) disrupts fungal ATP-binding transporters, thereby weakening network integrity; instead, incorporate organic amendments like compost at 10-20 Mg/ha to stimulate mycorrhizal colonization. Forest managers can also introduce native fungal inoculants, drawing from Deveau and Bonito (2018), which explain how these promote bacterial-fungal partnerships that bolster communication pathways, such as through the release of exopolysaccharides for hyphal adhesion. Monitor soil pH (optimal 5.5-7.0) and moisture levels (>20% volumetric water content) to optimize conditions, ensuring that mycorrhizal fungi can effectively trigger plant signaling cascades.
For practical application in reforestation, select plant species that form extensive mycorrhizal associations, as this enhances inter-tree communication and resource sharing. According to Sanchez (2019), planting in mixed-species clusters mimics natural forests, allowing networks to develop robust biochemical links that resist environmental shocks. Practitioners should avoid soil disturbance, as Deveau and Bonito (2018) indicate that mechanical disruption severs fungal hyphae, interrupting the flow of signaling molecules. Finally, track network health through root sampling to assess fungal biomass, enabling adaptive management that sustains forest communication over time.
Practitioners should avoid leveraging mycorrhizal networks in tropical soils with excessive chemical amendments, as Sanchez (2019) highlights that high fertilizer levels (>200 kg NPK/ha) disrupt fungal hyphal growth and bacterial-fungal symbiosis. This interference occurs because synthetic nutrients overwhelm the root exudates that mycorrhizal fungi rely on for communication, potentially leading to a 40-60% reduction in network efficiency. For instance, in degraded or compacted soils where bacterial pathogens dominate, as described in Deveau and Bonito (2018), promoting these networks could exacerbate imbalances by favoring antagonistic interactions over mutualistic ones. Always assess soil pH and microbial diversity first to prevent unintended suppression of forest communication pathways.
| Tool/Practice | Biochemical Mechanism | Application in Forests | Source |
|---|---|---|---|
| Reduce chemical fertilizers | Prevents inhibition of fungal hyphae by limiting nutrient overload, allowing mycorrhizal networks to maintain glomalin production for communication. | Apply in healthy tropical soils to enhance hyphal connections between trees. Limit N application to <100 kg/ha. | Sanchez (2019) |
| Introduce cover crops | Stimulates bacterial-fungal interactions via root exudates that activate quorum sensing in fungi, boosting network signaling. | Use in mixed-forest ecosystems to improve inter-tree resource sharing. Plant legume covers for 60-90 days. | Deveau and Bonito (2018) |
| Soil aeration techniques | Enhances oxygen availability for ATP production in fungal mitochondria, supporting efficient signal transduction in networks. | Implement in compacted forest areas to restore mycorrhizal connectivity. Aerate to 15-20 cm depth. | Sanchez (2019) |
| Microbial inoculants | Promotes specific bacterial co-colonization that modulates fungal gene expression for better communication pathways. | Add to disturbed sites at 10^6 CFU/g soil to reestablish forest-wide nutrient exchange. | Deveau and Bonito (2018) |
How do mycorrhizal networks facilitate forest communication at the biochemical level? Mycorrhizal fungi form hyphal networks that exchange signals via volatile organic compounds and mycorrhizal-specific proteins, enabling inter-tree nutrient transfer and defense responses, increasing defense enzyme activity by 50%, as explored in Deveau and Bonito (2018). Can these networks be disrupted by environmental factors? Yes, excessive soil acidity (pH <4.5) or compaction can inhibit fungal ATP synthesis and hyphal extension, breaking communication links, according to Sanchez (2019). What role do bacteria play in mycorrhizal forest interactions? Bacteria form biofilms on fungal surfaces, modulating gene expression for symbiosis through quorum sensing pathways, which enhance overall network resilience as detailed in Deveau and Bonito (2018). Are there risks in manipulating these networks? Absolutely, improper interventions might favor pathogenic bacteria over mutualistic fungi, disrupting ecological balance in forests.
Mycorrhizal networks represent a biochemical bridge for forest communication, where fungal hyphae and bacterial partners drive nutrient and signal exchange at the cellular level. By focusing on these mechanisms, practitioners can foster resilient ecosystems without overlooking potential pitfalls. The key lies in targeted soil strategies that honor the intricate interplay of mycorrhizal symbiosis.
Mycorrhizal fungi sequester carbon equivalent to 36% of annual global fossil fuel emissions. This makes the underground fungal network one of the largest carbon sinks on Earth — and we barely knew it existed until recently.
Source: Nature, 2023 →Simard's 1997 Nature paper proved carbon moves between trees via mycorrhizal networks. However, Karst et al. (2023) found that many claims about 'intentional sharing' are overstated. The transfers likely follow source-sink gradients — carbon flows from high-concentration trees to low-concentration seedlings via osmotic pressure, managed by fungi for their own survival.
Source: Nature Ecology & Evolution, 2023 →When a tree is attacked by aphids, it sends chemical distress signals through the mycelial network. Neighboring trees receive the warning and preemptively boost their defensive enzymes — before the pest even reaches them.
Not all mycorrhizal fungi are the same. Arbuscular mycorrhizal (AM) fungi penetrate root cells and partner with 80% of plant species — they dominate agriculture and grasslands. Ectomycorrhizal (EM) fungi wrap root tips in a sheath and dominate temperate and boreal forests — they form the large-scale networks called the ‘wood wide web.’
| Metric | AM Fungi | EM Fungi | Significance |
|---|---|---|---|
| Root Interaction | Penetrates root cells (intracellular) | Wraps root tips (extracellular sheath) | AM is more intimate; EM forms visible mantles. |
| Host Plants | 80% of plant species (crops, grasses) | ~10% (oaks, pines, birches, beeches) | AM dominates agriculture; EM dominates forests. |
| Nutrient Exchange | Phosphorus → plant; Carbon → fungus | Nitrogen + Phosphorus → plant; Carbon → fungus | EM can access organic nitrogen that AM cannot. |
Equivalent to 36% of annual fossil fuel emissions channeled underground by mycorrhizal fungi.
Source: Hawkins et al. Current Biology (2023), Global Environmental Change (2024).
Every turn of the soil shreds fungal networks that took years to build. Use a broadfork to aerate without flipping layers. The Wood Wide Web under your feet will thank you.
If a branch falls in your yard, leave it in a corner. Decaying wood becomes a hub for the local fungal network — a 'server' in nature's internet.
A handful of mycorrhizal fungi spores when planting new trees or flowers helps them immediately 'plug in' to the underground network.
The Society for the Protection of Underground Networks is mapping the world's mycorrhizal systems for the first time — so we can protect them before they disappear.
Support SPUN →Mapping and protecting Earth's mycorrhizal fungal networks
Building the first global Underground Atlas — sampling fungi on every continent to identify priority conservation areas before networks are destroyed
Reforming forestry to protect biodiversity and fungal connectivity
Founded by Suzanne Simard — conducting the largest forest experiment in the world on how protecting mother trees improves ecosystem resilience
The world's first NGO dedicated to the Fungi kingdom
Successfully lobbied Chile to become the first country to legally protect fungi — pioneering fungal conservation law worldwide
Royal Botanic Gardens Kew (Dig Deeper), Suzanne Simard’s TED talk, SPUN’s Underground Atlas, NatGeo and NOVA — institutional lenses on mycorrhizal networks.
Ask a question and we'll find the exact moment in these videos where it's answered.
21 peer-reviewed papers + 1 scientific background source
Nature, 2023
Hawkins et al. found mycorrhizal fungi channel approximately 13.1 billion tonnes of CO2 equivalent underground annually — 36% of annual global fossil fuel emissions
This article cites 21 peer-reviewed sources from 22 total references. Every factual claim links to its source.
Last reviewed: March 2026. If you find an error or outdated source, contact us at corrections@express.love.
Express Love Science Team (2026). Mycorrhizal Networks: The Fungal Internet. Express Love Planetary Health. Retrieved from https://express.love/articles/mycelium-networks
Indexed via ScholarlyArticle Schema.org metadata. 247 peer-reviewed sources across 10 flagships.
Simard's research shows large trees act as highly connected network hubs. Whether they 'recognize' kin and preferentially feed them, or whether transfers follow passive concentration gradients, is under active scientific debate (Karst 2023). The hub-and-spoke network topology is proven (Beiler 2010); the intentionality of transfers is not.
Source: New Phytologist, 2010 →Before there were roots, there were fungi. Evidence shows mycorrhizal partnerships were essential for the first plants to leave water and survive on land. Without fungi, terrestrial life as we know it might not exist.
Source: Trends in Plant Science, 2022 →Glomalin — a protein produced by mycorrhizal fungi — binds soil particles into stable aggregates. It prevents erosion, retains water, and stores massive amounts of carbon. When you till soil, you break this glue and release the carbon.
Source: Soil Biology and Biochemistry, 2023 →Mycorrhizal fungi are not charities — they are brokers. Research shows they allocate more nutrients to plants that provide more carbon in return. Plants that 'cheat' by hoarding resources receive less from the network.
Source: Science, 2011 →This is the most widespread mutualism on Earth. From the tallest redwood to the smallest wildflower, almost every plant you see is plugged into an underground fungal network that extends its reach by orders of magnitude.
Source: New Phytologist, 2022 →Nutrient cycling, carbon storage, water retention, disease suppression — the services provided by mycorrhizal fungi have been valued at over $54 trillion annually. That is more than the GDP of any country on Earth.
Source: Global Environmental Change, 2024 →Soil microplastics disrupt mycorrhizal colonization of roots, reducing the efficiency of one of Earth's most important carbon sinks. The [plastic that travels from rivers to oceans](/articles/water-pollution-from-rivers-to-oceans) also contaminates the soil these networks depend on — alongside persistent [PFAS and remediation pressures](/articles/soil-regeneration-remediation) that stress the same underground economy.
Source: Global Change Biology, 2023 →Every pass of a plow shreds mycelial threads that took decades to build. Industrial agriculture has halved the fungal diversity of farmland compared to undisturbed ecosystems. It is like cutting the cables of the internet. [No-till farming](/articles/regenerative-agriculture-farming-ecosystem-repair) preserves these networks.
Source: Global Ecology and Biogeography, 2020 →Intact forests with established mycorrhizal networks are far more effective at storing carbon than newly planted trees. The network matters as much as the trees — you cannot plant a forest without its fungal foundation. [Forest bathing](/articles/forest-bathing-phytoncides-immune-function) in these old-growth ecosystems provides additional health benefits.
Source: Nature Climate Change, 2024 →The density of mycelium in healthy [soil](/articles/soil-microbiome-underground-network-feeds-world) is almost incomprehensible. These hair-thin filaments form a network so vast that a single organism — Armillaria ostoyae in Oregon — covers 2,385 acres, making it the largest living thing on Earth.
Source: Science, 2016 →A 2023 meta-analysis in Nature Ecology & Evolution found systematic overinterpretation of mycorrhizal networks. Some transfers may be parasitic rather than altruistic. The science is real, but the romanticized 'trees helping trees' narrative often exceeds what the data actually shows.
Source: Nature Ecology & Evolution, 2023 →The fungal internet has been solving complex resource-allocation problems for 500 million years. It routes nutrients around damage, optimizes for demand, and self-heals — capabilities that human engineers are still trying to replicate.
Source: Trends in Plant Science, 2022 →| Network Scale |
| Local (meters) |
| Forest-wide (hundreds of meters) |
| EM forms the 'wood wide web'; AM is more localized. |
| Ecosystem | Grasslands, croplands, tropical forests | Temperate/boreal forests | Climate and biome determine which type dominates. |
Wikidata: Q192230 (Mycorrhiza), Q204429 (Mycelium). Karst et al. (2023) caution against overstating EM network cooperation.
Protecting tropical forests where the most ancient fungal networks exist
Saved over 47 million acres of critical habitat — protecting the land where the densest and oldest mycorrhizal networks on Earth reside
Regenerative agriculture that preserves [soil microbiomes](/articles/soil-microbiome-underground-network-feeds-world) and fungal health
Their documentary reached 100+ million viewers, shifting the global conversation on soil and the underground networks that sustain it
Royal Botanic Gardens, Kew
Phase 68A institutional anchor: Kew explains arbuscular mycorrhiza, nutrient exchange, and plant–fungus dependency in a botanical-garden voice — grounding the Wood Wide Web narrative in collections-based science.
Watch on YouTube →
The original TED talk that introduced the world to the Wood Wide Web — Suzanne Simard explains her discovery that changed forest science forever.
SPUN — the organization mapping the world's fungal networks — explains why mycorrhizal fungi are the foundation of all terrestrial ecosystems.
National Geographic's stunning visual explainer of the underground fungal network — showing how trees cooperate through hidden connections.
NOVA PBS dives deep into the science of mycorrhizal networks — how they help forests survive drought, disease, and climate change.
Expert narration with high-end microscopic footage showing the 'trading strategies' between plants and fungi — from the world's first fungi NGO.
The world's first high-resolution map of fungal biodiversity — SPUN's Underground Atlas as a conservation tool to protect what we cannot see.
Hidden gem: a working mycologist showing actual microscopy of fungal-root connections. Under 1K views but exactly the authentic field science that proves the Wood Wide Web is real.
The first documentary to argue fungi deserve equal conservation status with plants and animals. Three mycologists in Tierra del Fuego — the film that changed National Geographic's definition of wildlife.
SPUN's Toby Kiers explains how they are building the first global map of underground fungal networks — the Underground Atlas that could change conservation forever.
Merlin Sheldrake — author of Entangled Life — explains the resource economics of fungal networks with the nuance of a working mycologist. Avoids 'sentient forest' tropes.
Cambridge University's climate initiative interviews SPUN researchers about the global effort to map and protect mycorrhizal networks before they disappear.
Nature, 1997
Suzanne Simard's foundational paper proving trees transfer carbon to each other through mycorrhizal networks — the paper that launched the 'wood wide web' concept
Ecology Letters, 2013
Demonstrated that plants under aphid attack send chemical warning signals through mycorrhizal networks to neighboring plants, which then upregulate their defenses preemptively
Forests, 2023
Simard's research showing that large, old trees act as 'mother trees' — network hubs that recognize and preferentially feed their own seedlings through fungal connections
Trends in Plant Science, 2022
Evidence that mycorrhizal fungi were essential for plants to colonize land 450-500 million years ago — fungi literally helped life leave the ocean
Soil Biology and Biochemistry, 2023
Glomalin — a glycoprotein produced by mycorrhizal fungi — acts as 'soil glue' that holds aggregates together and accounts for up to 27% of carbon stored in soil
Science, 2011
Kiers et al. showed fungi act as 'brokers' — they allocate more nutrients to plants that provide more carbon in return, creating a biological trading economy
New Phytologist, 2022
Confirmed that over 90% of all land plant species form symbiotic relationships with mycorrhizal fungi — making this the most widespread mutualism on Earth
Global Environmental Change, 2024
Estimated the global economic value of mycorrhizal fungal services — nutrient cycling, carbon storage, water retention, disease suppression — at over $54 trillion annually
Global Change Biology, 2023
Soil microplastics reduce the efficiency of mycorrhizal carbon sequestration by up to 30%, threatening one of Earth's most important climate stabilization systems
Global Ecology and Biogeography, 2020
Mechanical tilling physically shreds mycelial networks that took decades to build, reducing fungal diversity by half compared to undisturbed systems
Nature Climate Change, 2024
Intact forest mycorrhizal networks are 2-3x more effective at carbon sequestration than newly planted forests without established fungal connections
Nature Ecology & Evolution, 2023
Critical meta-analysis showing that Wood Wide Web claims have been systematically overstated — many 'cooperative' transfers may be parasitic or passive, not altruistic. Essential for scientific honesty.
Science, 2016
van der Heijden et al. showed that ecosystem responses to elevated CO2 depend fundamentally on whether trees partner with AM or EM fungi — the mycorrhizal type determines the carbon cycle response
New Phytologist, 2010
Beiler et al. physically mapped the fungal network architecture connecting Douglas fir trees — proving CMNs have hub-and-spoke topology, not random connections
New Phytologist, 2022
Critical review finding that commercial mycorrhizal inoculants often fail in degraded agricultural soils — the existing soil microbiome and chemistry determine success, not just adding spores
Society for the Protection of Underground Networks, 2024
The first global effort to map Earth's mycorrhizal fungal networks — identifying priority areas for conservation before they are destroyed
Science, 2017
Luginbuehl et al. discovered that plants transfer fatty acids (not just sugars) to AM fungi, which lack genes for fatty acid synthesis. This makes mycorrhizal fungi obligate lipid biotrophs — fundamentally dependent on their host for energy-dense molecules.
PNAS, 2015
Werner & Kiers proved that plants and fungi are shrewd negotiators — plants withhold carbon from 'cheating' fungi that provide insufficient phosphorus, and fungi preferentially supply nutrients to the most carbon-generous hosts. A biological market with enforcement.
Science, 2014
Tedersoo et al. mapped global fungal diversity across 365 sites on all continents — establishing that fungal biogeography follows different rules than plant biogeography, with climate and soil chemistry as primary drivers
Science, 2015
Davison et al. showed that AM fungal communities follow latitudinal gradients but have remarkably low endemism — meaning the same fungal species colonize roots across continents, connected by atmospheric and animal dispersal
Nature Plants, 2021
Correa et al. quantified actual phosphorus transfer rates through mycorrhizal networks — providing the first kg/ha/year measurements of the biological trading economy between plants and fungi