Hygrocybe conica
FungiFamily: Hygrophoraceae · Genus: Hygrocybe

Lukas Hochenleitter und Kompagnie. · public_domain
About
Hygrocybe conica is a species of agaric in the family Hygrophoraceae. In the UK it has been given the recommended English name of blackening waxcap, since all parts of the basidiocarp blacken with age. In North America it is commonly known as the witch's hat, conical wax cap or conical slimy cap. Hygrocybe conica is known to be a complex of at least eleven closely related species and as such is widespread in Eurasia, North America, and elsewhere.
Summary from Wikipedia
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Growing details and traits for Hygrocybe conica in the Library.
No cultivars in the Library yet — the full profile above covers the species itself.