Concept

Mycorrhizal network

Also known as: Wood Wide Web, Common mycorrhizal network, CMN

The underground network of mycorrhizal fungi that physically connects the roots of multiple plants — often dozens or hundreds of plants of multiple species — through which water, nutrients, and carbon flow between plants. Documented across forest, prairie, and agricultural ecosystems. Suzanne Simard's foundational research at the University of British Columbia in the 1990s and 2000s established that 'mother trees' redistribute carbon and nutrients to seedlings, kin, and stressed neighbors through these networks. The network is one of the most-consequential discoveries in plant ecology and reshapes how we understand plant cooperation, forest function, and the substrate beneath every terrestrial ecosystem.

What the network is

[[mycorrhizal-fungi|Mycorrhizal fungi]] (literally “fungus root”) form symbiotic associations with the root systems of approximately 90% of land plant species. The fungal hyphae extend far beyond the plant’s own roots — by orders of magnitude — bringing back water and nutrients in exchange for plant sugars.

What [[suzanne-simard|Suzanne Simard]] and others established is that a single fungal individual is typically connected to multiple plants — often dozens or hundreds, often of different species. Through these shared connections, water, nitrogen, phosphorus, carbon, and signaling molecules flow between plants.

What flows through it

Documented network exchanges include:

Carbon — from large trees (“mother trees”) to seedlings, especially shaded seedlings under closed canopy
Water — from deep-rooted to shallow-rooted plants, especially during drought
Nutrients — particularly nitrogen and phosphorus, often moving from healthier plants to stressed neighbors
Defense signals — plants under herbivore attack send chemical signals through the network that prime defense responses in connected neighbors
Allelopathic chemicals — some plants use the network to suppress competitors

Suzanne Simard’s contribution

Canadian forest ecologist [[suzanne-simard|Suzanne Simard]] (University of British Columbia) led the foundational research from her 1997 PhD work onward. Her radioisotope tracer experiments demonstrated bidirectional carbon flow between Douglas fir and [[birch|paper birch]] through shared mycorrhizal networks — overturning decades of assumed competition-only forest ecology.

Her 2021 book [[finding-the-mother-tree|Finding the Mother Tree]] brought the work to a popular audience. She has since helped reshape forestry policy in British Columbia and elsewhere.

Why it matters

The network is one of the strongest empirical cases against the dominant 20th-century framing of nature as primarily competitive. It demonstrates that cooperation is the substrate beneath competition — forests, prairies, and even agricultural systems function through deep networks of [[mutual-aid|mutual aid]] mediated by fungi.

For 0mn1.one, the mycorrhizal network is foundational. [[cognitive-symbiosis|Cognitive symbiosis]] and [[distributed-cognition|distributed cognition]] both draw empirical grounding from this research.

Sources

[[finding-the-mother-tree|Finding the Mother Tree]], [[suzanne-simard|Suzanne Simard]] (Knopf, 2021)
[[the-hidden-life-of-trees|The Hidden Life of Trees]], Peter Wohlleben (Greystone Books, 2016)
Simard et al. (1997) “Net transfer of carbon between ectomycorrhizal tree species in the field,” Nature
Multiple subsequent peer-reviewed publications

Rooted in life.

What links here, and how

Inbound connections from across the wiki, grouped by lens and by relationship. These appear automatically — every entity page declares what it links to, and that data populates here on the targets.

Scientific

rests on

Cognitive Symbiosis the plant-fungus partnership is the canonical biological case — neither host nor symbiont is doing the work alone; the network is the unit

featured in

The Hidden Life of Trees the book's load-bearing scientific frame is the wood-wide-web research of Suzanne Simard and colleagues; Wohlleben translates it for general readers
The Overstory the novel's botanist character Patricia Westerford is closely modeled on Suzanne Simard; the mycorrhizal-network science is the novel's structural anchor

3 inbound links · 3 outbound