page_title: Cortinarius delibutus
section_title: Description
hierarchical_section_title: Cortinarius delibutus / Description
caption_attribution_description: Cortinarius delibutus from Commanster, Belgium. If you think this is a different taxon, please contact James Lindsey.
context_page_description: Cortinarius delibutus, also known as the bluegill webcap or the yellow webcap, is a basidiomycete fungus of the genus Cortinarius. The fruit bodies are medium-sized, with shiny yellow caps on a sticky, yellow-banded club-shaped stem. The mushroom is found in Europe and North America, usually near birch or beech trees.
context_section_description: The cap is 4–8 cm (1.6–3.1 in) in diameter, initially pale yellow then darker as it matures, and sandy in the middle. It has a campanulate (like a bell) to convex shape, later becoming flattened, with a very blunt umbo. The cap is fleshy in the center, but becomes thinner towards the margin. Its surface is smooth and sticky, but eventually becomes covered with silky fibers. The gills are crowded together, broad, adnexed, and slightly emarginate (notched) at the stem. They are bluish when young, later turning cinnamon as the spores mature. The stem is 5–10 cm (2.0–3.9 in) long and about 1 cm (0.39 in) thick, measuring up to 2 cm (0.8 in) thick in the swollen part of the base. It is quite flexible, faintly bluish at the top when young, white when mature with a faint tinge of yellow, smooth, sticky or shiny, and with a cortina at the top forming an annular zone. It is narrower at the apex and usually clavately thickened at the base, stuffed, then hollow. The flesh is white, then slightly yellowish, soft, with mild taste, sometimes slightly bitter when mature, with no distinguishable odor. The mushroom is inedible.
  The spores are spherical to egg-shaped, drawn into an apiculus at the base, pale rust colored and coarsely verrucose (wart-like), measuring 7–8 by 6.3–6.5 μm. The basidia (spore-bearing cells) are 25–30 by 9–10 μm. The spore deposit is ochraceous rust.
caption: Gills in mature individuals are cinnamon-colored.
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