Habitat: Bovine, Equine Dung and Enriched Soils
Strain Origin: Puerto Rico, near the town of Canovanas located on the Northeast side of the island.
Cap: 50-75 mm in diameter, convex to broadly convex to nearly plane at maturity. Brown maturing to golden brown to light yellow. Surface dry with fine persistent remnants of universal veil on cap (spots). Flesh white soon bruising bluish green.
Stem: 125+ mm in length, yellowish. Flesh bruising bluish green where injured. Persistent membranous annulus (ring) from partial veil that becomes dusted with purple brown spores at maturity.
Gills: Attachment adnate to adnexed. Grayish coloration in young fruit bodies becoming nearly black in maturity.
Spores: Dark purplish brown, subellipsoid on 4-spored basidia
Form can be quite variable under laboratory conditions.