pileus_surface_fibrillose
fibrils|<pileipellis> fibrils
smooth or with scattered fibrils, more densely concentrated toward the center, often as an appressed tomentum in young stages, margin regular and rolled under at first, sometimes remaining turned even in age, concolorous with the center or paler brown or tan, sometimes with shallow radially arranged ridges extending about 2-5 mm toward the disc, becoming somewhat hygrophanous and unevenly colored in age
Armillaria solidipes
Armillaria solidipes