Melanoleuca polioleuca (Fr) Kühner & Maire syn. Melanoleuca melaleuca (Pers. ex Fr.) Murr. syn. Tricholoma melaleucum (Pers. ex Fr.) Kummer Gemeiner Weichritterling Változékony (márványos) lágypereszke. Cap 3–8cm, convex then flattened, often slightly depressed with a central boss, smooth, dark brown when moist drying buff. Stem 40–70 x 8–14mm, slightly bulbous, whitish covered in dark grey-brown longitudinal fibres. Flesh white in cap, flushed ochraceous to ochre-brown from stem base upwards. Taste and smell not distinctive. Gills crowded, sinuate, whitish to cream. Cheilocystidia thin-walled, hyaline, harpoon-shaped. Spore print cream. Spores elliptic, minutely ornamented, amyloid, 7–8.5 x 5–5.5um. Habitat woods and pastures. Season late summer to late autumn. Common. Said to be edible – not recommended. (Never eat any mushroom until you are certain it is edible as many are poisonous and some are deadly poisonous.) Distribution, America and Europe.