Shelf fungus on a trunk usually means decay has been working inside the tree for years, and damp fall weather is when it becomes easy to spot.
These firm, shelf-shaped growths, also known as conks or bracket fungus, are the fruiting body of a wood-decay fungus. Conks low on the trunk or root flare can indicate root and butt rot, which weakens the base of the tree. Conks higher up may point to decay in one limb that can be pruned out.
Knocking the fungus off does not stop the decay, and many trees with conks stand safely for a long time. Large oaks and maples near homes and driveways deserve a closer look before winter wind arrives. Greg Smith Tree Service evaluates trees across Gloucester County with an owner-operator on every job.
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Real photo of bracket or shelf fungus on a trunk or root flare from a South Jersey job, ideally paired with a cross-section of a removed log showing internal decay. Avoid stock mushroom imagery.
Canva text suggestion: "Shelf Fungus Means Look Closer" or "The Decay You Can't See Matters Most"