applanatum

Artists Conk, Artists Bracket

Ganoderma applanatum, commonly known as the Artist's Conk, is a perennial polypore fungus widely distributed across temperate and tropical zones. It is characterized by its hard, woody, shelf-like fruiting body that lacks a stalk (sessile) and attaches broadly to the substrate. The upper surface is dull, gray-brown to cocoa-brown, often forming concentric furrows or zones that represent annual growth layers. Unlike the shiny, lacquered surface of the related Reishi (Ganoderma lucidum), G. applanatum has a matte, unvarnished crust. It functions ecologically as a white-rot decomposer, breaking down lignin in dead or dying hardwood trees, though it can also act as a necrotrophic parasite on living hosts, causing heart rot. The most distinctive feature of this species is its fresh pore surface, which is white to creamy-white and bruises dark brown instantly when scratched or rubbed. This characteristic allows for the creation of permanent intricate etchings, giving rise to its common name. The fungus is a prolific spore producer, capable of releasing up to 30 billion spores daily during its active season, often coating the surrounding area in a layer of cocoa-brown dust. As a perennial species, individual conks can persist for many years, adding a new layer of tubes and cap tissue each growing season, eventually reaching sizes of up to 75 cm or more in width.