Key takeaways
- Wood is made of cellulose, hemicellulose and tough lignin.
- Fungi release enzymes that break wood down; white rot fungi digest lignin.
- Decomposition recycles nutrients and creates habitat.
- Fungi are important players in the carbon cycle.
Without fungi, forests would be buried in dead wood. This article explains how fungi break down wood and why that matters for the planet.
Why wood is hard to break down
Wood is made mainly of cellulose, hemicellulose and lignin. Lignin in particular is extremely tough and resistant to decay. Few organisms can break it down effectively, and fungi are the most important of them.
How fungi do it
Fungal hyphae grow into wood and release enzymes that break its components into smaller molecules the fungus can absorb. White-rot fungi, including many functional mushrooms, can break down lignin itself. See Parasitic and Wood-Decaying Fungi Explained.
Recycling nutrients
As fungi decompose wood, they release carbon and nutrients back into the ecosystem, enriching soil and feeding new growth. Rotting wood also becomes habitat for insects, birds and other organisms.
A key part of the carbon cycle
Wood decay is a major route by which carbon locked in trees returns to the atmosphere and soil, making fungi important players in the global carbon cycle.
Fungi you might see
On a woodland walk you may spot brackets such as the artist’s bracket or Oyster mushrooms on fallen logs, visible signs of this hidden work.
Harnessing it
Growers use the same ability to cultivate mushrooms on wood and agricultural by-products. See Mushroom Substrates Explained.