The Big Smoky Bracket (*Bjerkandera fumosa*) is a master of understated elegance in the fungal world. Often overlooked by those seeking bright colors, this polypore offers a rewarding study for the patient naturalist.
Identification
Look for thick, corky, fan-shaped brackets (2–12 cm across) that often grow in fused, overlapping tiers. The upper surface is velvety when young, maturing to a smooth, buff or clay-tan color. The "smoking gun" for identification lies underneath: the pore surface is a distinct smoky-grey. If you are unsure, use a knife to cross-section the fungus. You will see a thin, dark, resinous line separating the pale context (flesh) from the greyish tube layer. This "Bjerkandera line" distinguishes it from the thinner, darker-edged *B. adusta*.
Habitat & Range
Widely distributed across the Northern Hemisphere, *B. fumosa* is a specialist of deciduous hardwoods. It is particularly fond of damp, low-lying areas, thriving in riparian zones on the wood of willow, poplar, ash, and elm. You’ll find it from sea level up to montane forests, usually clinging to stumps or fallen logs.
Behaviour
As an annual fungus, it appears in late summer and autumn, though its leathery brackets can persist through winter. An observer will notice it growing in "imbricate" clusters—shingled like a roof. While it doesn't "move," its growth is responsive to gravity; if a log rolls over, the fungus will begin growing new "shelves" at a 90-degree angle to the old ones to ensure its spores can drop freely.
Diet
This species is a saprobic powerhouse. It feeds by secreting enzymes that break down lignin and cellulose in dead wood, causing a "white rot." By recycling these complex polymers, it returns vital nutrients to the forest floor.
Fascinating Fact
While many polypores smell like damp earth or wood, a fresh *Bjerkandera fumosa* often emits a surprising, sweet fragrance reminiscent of anise or licorice—a delightful olfactory reward for the curious hiker!