Hericium erinaceus
A tooth fungus of hardwoods, found across North America, Europe and Asia. It produces a single white, hanging mass of long spines from wounds in living or dead trees, especially oaks. In the wild it fruits in late summer and autumn, or through winter in mild climates. Cultivators grow it on supplemented hardwood sawdust, colonising warm and fruiting cool in very humid, well-ventilated air.
Where it grows wild
It is a white-rot decomposer that also colonises living trees. It fruits singly or in pairs from wounds, scars and cut stubs on living hardwoods, especially oaks, and on logs and snags. Hosts include oak, beech, maple, ash and eucalyptus. It causes a white pocket rot in the heartwood, and the fruitbody grows from a hidden attachment point in the wood.
It is a lowland to mid-elevation forest fungus. The few records with an elevation lie at 121–297 m, which doesn't represent the whole range.
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The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY-SA 3.0 licence, unmodified.