small mushrooms, several in small clusters to scattered on well-rotten damp poplar log (3-4" diameter) ST: 15-20x3-4mm, dark brown, v fine white puberulent near base, v tough and rigid, solid, pale inside, curved CAP: 20-40mm wide, convex but v strongly umbilicate, irreg wavy-contorted, light to dark brown, gen lighter at margin, not viscid even when wet, soft but not v fragile FLESH: light brown, ~1mm thick VEIL: no sign GILL: whitish, distant, slightly decurrent, v conspicuously ragged/toothed SPORE: print pure white