Cortinarius alboviolaceus, commonly known as the silvery-violet webcap, is a basidiomycete mushroom of the genus Cortinarius native to Europe and North America.
The mushroom is lilac, later yellowing and often becoming whitish/grayish. Its cap is 3âÂÂ8 cm wide, conical to umbonate, dry, silky, with whitish to pale lilac flesh. The gills are adnate or adnexed, grayish lilac becoming brown as the spores mature and lend their color. The stalk is 4âÂÂ8 cm tall and .5âÂÂ1.5 wide, larger at the base, sometimes with white veil tissue. The odour and taste are indistinct.
Similar species include the essentially identical C. griseoviolaceus, as well as Inocybe lilacina. C. camphoratus is similar, but with a foul odour. C. malachius has a grayish cap and, when dry, a scaly surface.
Its edibility is considered unknown by some guides but it is not recommended due to its similarity to deadly poisonous species. At least one guide considers it edible, but not recommended. Conflicting accounts indicate that it may itself be poisonous.