lentrichard, 
Most likely Phaeolus schweinitzii (dyer's polypore). Boxborough, #Massachusetts, 18 July 2015.
"As its common name suggests, the dyer's polypore is an excellent natural source of green, yellow, gold, or brown dye."
Fascinating, as I thought "Dyer" was a person's name. Although "schweinitzii" is from a person's name.
See https://en.m.wikipedia.org/wiki/Phaeolus_schweinitzii
#nature #naturephotography #mushrooms #saprophytes #fungi #fungus #biology #biodiversity #ecology #mycology #forests #MushroomsOfMastodon