These are inedible mushrooms belonging to the species Cortinarius collinitus (Cortinariaceae) and commonly known as Blue-girdled Webcap.
The caps vary from mid brown to dark brown, generally with a lighter region near the rim and with faint radial streaks. Very slimy in wet weather, the caps eventually dry to a smooth glossy finish. The diameter ranges from 3 to 10cm at maturity. The top of the stipe is white; the central section is irregularly banded with the viscid veil remains and tinged with violet; the lower part is brown.
This mushroom occurs in Britain, Ireland, throughout northern Europe and in North America.
Photo credit: ©Erminio Ferrari | Locality: unknown (Europe)
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