Overview
The Birch Mazegill (Trametes betulina), also known as the Gilled Polypore or Lenzites betulina, is a fascinating and deceptive bracket fungus native to northern birch woodlands. While its upper cap surface looks almost identical to a classic Turkey Tail with multicolored concentric zones of grey, cream, and orange, looking underneath reveals an astonishing surprise: instead of pores, it bears a dense array of blade-like gills that radiate outward like a maze.
Biology and Physical Characteristics
Trametes betulina produces semicircular, fan-shaped to tiered leathery brackets that attach directly to dead wood without a stem. The upper cap surface is densely velvety to hairy, adorned with concentric bands of cream, buff, grey, and rusty-brown, often developing green algae overtones with age. Its underside features radiating, labyrinthine gills with wavy or slotted margins, combining the structural features of both polypores and agarics.
Behavior and Ecology
Operating as an active white-rot saprotroph, the Birch Mazegill colonizes dead hardwood logs and stumps, showing a strong affinity for birch (Betula), beech, and oak. Its tough, leathery texture allows it to endure harsh winter freezing without rotting, resuming spore dispersal in warm, wet spring weather.
Conservation and Human Impact
Classified as Least Concern by the IUCN, Trametes betulina is exceedingly common and ecologically vital throughout northern temperate woodlands, playing a foundational role in decomposing forest timber and releasing locked carbon and minerals back into the soil.
Interesting Factoid
The Birch Mazegill is a master of fungal illusion: it looks exactly like a common pore bracket from above, but flip it over and it reveals a maze of gills, making it a polypore disguised as a mushroom.