Cap: (1)3 — 7(10) cm broad. Convex to obtusely campanulate with an incurved margin at first, rarely becoming plane, often umbonate or with a slight depression in the center, viscid when moist from a separable gelatinous pellicle, margin slightly translucent-striate when moist, hygrophanous, yellowish brown to reddish brown with a silvery-blue metallic luster, paler at the margin, drying to a beige or straw yellow. Readily bruising blue when handled, the younger specimens bruising bluish olivacous or even blackish. Often has a great variation in color and form.
Gills: Adnate to sinuate, close to subclose, whitish, yellowish grey when young becoming dark violacous brown to sepia brown with age, the edges remain slightly whitish.
Spores: Dark violacous brown.
Stipe: (2)5 — 9(13) cm long, (5)8 — 10(12) mm thick. Equal or enlarging slightly at base, somewhat flexous, hollow, subpruinose to flocose, whitish to reddish brown or blackish, readily bruising blue, sometimes with rhizomorphs attached to the base. The veil is well developed but not forming a permanent annulus.
Taste: Strongly farinaceous.
Odor: Strongly farinaceous, less with age or when dry.
Microscopic features: Subrhomboid to subellipsoid, (6)6.7 — 8(8.5) x 4 — 6 µm. Basidia 4-spored, occasionally 2-spored. Pleurocystidia absent. Cheilocystidia 15 — 22(25) x 4.5 — 6 µm, fusoid with a flexuous neck 1 — 2.5 µm broad.