A slimy yellow webcap whose gills are bluish to violet when young. It grows mainly with birch, aspen and beech, and the blue young gills set it apart from most other yellow, slimy Cortinarius species.
Inedible. Not recommended: webcaps should never be collected for the table. Cortinarius includes deadly species such as C. orellanus and C. rubellus that contain orellanine, which causes kidney failure that appears only after a delay of days, often after the meal has been forgotten.
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Habitat
Ectomycorrhizal, scattered or in groups in deciduous and mixed woods in autumn, mainly with birch and aspen, also beech and occasionally spruce.
Distribution
Temperate Northern Hemisphere: widespread in Europe, including Britain and Ireland, and recorded from the northern United States and Canada.
Characteristics
Cap: 3-8 cm, hemispherical to convex, later flattened with a blunt umbo; yellow, darkening with age; greasy to slimy when wet; margin long inrolled. Gills: adnate to slightly notched, close to moderately spaced; bluish to violet when young, becoming cinnamon. Stem: 5-10 cm long, 0.3-1 cm thick, club-shaped or slightly bulbous; bluish near the apex when young, otherwise whitish to yellowish; sticky, with yellowish veil remnants forming a ring zone that turns rusty from fallen spores. Flesh: whitish to yellowish, faintly bluish in young specimens; taste mild, sometimes slightly bitter. Spore print: ochraceous rust. Spores: about 7-9.5 x 6-7 um, subglobose to broadly ellipsoid, coarsely warted (First Nature; Wikipedia).
