Artist's Conk
Artist's conk forms large, flat, semicircular brackets — gray to grayish-brown on top with faint concentric growth zones, woody and hard with age, sometimes reaching a foot or more across. Unlike most bracket fungi, it is perennial: the same conk survives for years, adding a new white layer of pores to its underside each growing season, so a cut cross-section shows layered growth rings much like a tree. The flat white pore surface is the source of its common name — any mark or scratch on fresh growth bruises brown within minutes and stays that way permanently, which is why the fresh underside has long been used as a natural canvas for scratched or etched drawings.
White rot of the heartwood and lower trunk; broad, flat, gray-brown woody shelves form at wounds, old branch stubs, or the trunk base and persist for years, adding a new white pore layer each growing season.
Enters through wounds, old pruning cuts, or root damage on mature hardwoods, especially maple, beech, elm, birch, and poplar; favored by injury and age.
There is no cure for the internal rot. Manage the tree rather than the fungus: avoid wounding the trunk and roots, prune cleanly, and have trees fruiting conks near paths, structures, or other targets professionally assessed for structural safety.
Also colonizes dead stumps and fallen hardwood logs, slowly breaking down lignin over many years as a long-lived wood decomposer.
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