Spotted growing in a crevice of the stone mountain top at the Summit House - Hadley, MA
Discoid head with linear leaves and coarsely serrate leaf margins. Serrate leaf margins appear not to be typical of G. n. discoidea.
I can never tell apart the chambers and the hairy paintbrush. It's one of the two anyway!
POLVEA on the right, POLVEV on the left
Hard to see but the leaves match Platanthera