Common Names: Ridged tooth
Centrally depressed caps measuring 2 to 6 cm in diameter. These caps can fuse together to form concrescent fruitbodies. The caps have wavy edges, and an initially felty surface that becomes scaly with age. Young fruit bodies are white, then pinkish-brown, then purplish brown, sometimes with white margins. Fruitbodies can become shiny in age. The spines on the cap underside are up to 4 mm long. They are initially white, but become purplish brown in maturity. The spines are decurrent—they run down the length of the stipe. The stipe, which is roughly the same color as the cap, measures 2 to 3 cm long by 1 to 1.5 cm thick. Mycelium at the base of the stipe envelops and grows around forest litter. The flesh smells mealy (similar to freshly ground flour).
Found in mixed woods, with oak, between August and September.