sensu lato, doubtfully true A. gallica; see https://www.mdpi.com/2076-0817/7/4/83, Coetzee, M., Wingfield, B. D., & Wingfield, M. J. (2018). Armillaria root-rot pathogens: species boundaries and global distribution. Pathogens, 7(4), 83. Perhaps ITS not suitable for species ID.
Sporocarps largely terrestial, but all attached to fallen/buried sticks and logs; ~50-100 sporocarps scattered in ca. 50 sq. m. Residential upland hardwood forest, under Quercus virginiana.