Ganoderma lobatum
https://www.mushroomexpert.com/Ganoderma_lobatum.html
Ecology: Saprobic; growing alone or gregariously on decaying logs and stumps of various hardwoods; causing a white rot; annual or perennial, lasting for 1-3 years; widely distributed in North America east of the Rocky Mountains; also found in Arizona and in Mexico. The illustrated and described collection is from Michigan.
Cap: 4-10 cm across; 8-14 cm deep; more or less semicircular in outline, or elongated; producing a new cap each year below the last year's cap and confluent with it; surface with a dull, unvarnished outer crust that is soft enough to be punctured with one's thumb, sometimes furrowed in "zones," brownish to grayish brown; bald.
Pore Surface: Whitish to pale brownish; bruising brown; with 4-6 tiny, circular pores per mm; tubes 0.5-1.5 cm deep.
Stem: Absent.
Flesh: Dark brown to cinnamon brown; woody.
Odor and Taste: Not distinctive.
Chemical Reactions: KOH instantly black on cap surface, flesh, and tubes.
Microscopic Features: Spores 6-9 x 4.5-6 m after the collapse of the hyaline vesicular appendix; more or less ellipsoid, with a truncated end; appearing double-walled, with a series of "pillars" between the walls; finely stippled; inamyloid; reddish brown in KOH. Cystidia and setae not found. Hyphal system trimitic. Clamp connections present.
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