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How do shelf fungi grow on living and dead trees?
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fungus
A pair of panther cap mushrooms (Amanita pantherina). Closely related to the death cap mushroom (Amanita phalloides), the panther cap is highly poisonous.
Shelf fungi, which belong to the order Polyporales, grow on both living and dead trees by acting as decomposers or pathogens that break down complex plant materials.12
When growing on wood, these fungi utilize a process called absorptive nutrition. They excrete specialized enzymes that digest cellulose and other complex carbohydrates within the tree's cell walls, converting them into simpler molecules that the fungus can absorb for nourishment.1
- On Dead Wood: Many species function as saprotrophs, efficiently decomposing dead timber, fallen logs, and stumps, which plays a vital role in nutrient cycling within forest ecosystems.12
- On Living Trees: Some shelf fungi act as parasites, invading the bark or internal tissues of living trees. They can cause significant damage, such as heart rot or root rot, by breaking down the tree's structural integrity.12
The visible portion of the fungus is the sporophore, or fruiting body, which emerges from the wood to release spores for reproduction. These structures are often tough and woody, taking on their characteristic fanlike or shelflike shape as they develop on trunks and limbs.324