This variety of fungus originates from Oak Ridge, TN. Its cap can measure between 25-75 mm in diameter and ranges from hemispheric to convex, expanding to broadly convex or nearly flat with age. Initially dark red, it matures into a golden brown shade and features fine fibrillose veil remnants in its youth, which disappear soon after. Its flesh is white, turning bluish green when bruised.
The stem is typically 150-200+ mm long and often equal, sometimes slightly enlarged at the base and occasionally contorted. It appears yellowish to buff with a reflective sheen and bruises bluish, while also being hollow. The partial veil is membranous, leaving a persistent membranous annulus that is well dusted with purplish brown spores even before tearing away from the cap. The gills are adnate to adnexed, grayish when young, and nearly black when mature.
The spores are subellipsoid, measuring 13 by 8 micrometers on 4-spored basidia, and have a dark purplish-brown hue. Jeetered originally collected this species from equine dung, located five miles west of the Y12 National Nuclear Laboratory in Oak Ridge, Tennessee. This variety is particularly cold-hardy and disease-resistant and represents the northernmost collection recorded for this species.
