Growing in mixed woods in the Big Sandy Creek Unit. Caps up to 6.8 cm across but there was a significantly larger one that was too old to collect. Cap was somewhat tacky. Spore print was white and spores amyloid. Spores ~ 7.2-8.1 X 6.0-7.0 microns, moderately warted and with some partial reticulations. When I cut these after returning to my motel room, I was surprised that the flesh turned instantly black. Also there was some reddish spots on the gills, which can be seen in the photo of the sliced specimen. Didn't note the odor or taste but the dried specimen retains a slightly pungent odor. Russula densifolia matches in all regards except for the apparent very rapid blacking. May have something to do with the delay in cutting them open after some hard travel.