Cap is ochraceous-brown, becoming darker toward the centre. It starts as convex with a strongly incurved or inrolled margin, later slightly expanding. The surface is smooth or slightly sticky, and the cuticle peels halfway toward the centre. The flesh is white, moderately thick, hard and brittle. Gills cream or straw-coloured, becoming spotted or discoloured brown, adnate or emarginate, forking, soft and flexible, narrow, and crowded. Stem whitish, staining brown, more or less equal, stout, pruinose near the apex, otherwise smooth. The stem flesh is white, hard and brittle. It has no ring. Spore print creamy to yellow.
Microscopic Features: Spores are subglobose to subovoid to subellipsoid, measuring 7.6-10.5 x 6.5-9 μm. They have low isolated warts, heavy ridges, and fine lines, sometimes creating a broken reticulum. Spores have thin walls.
Russula mustelina on the MykoWeb Web site.
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