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Species library › Hypsizygus › Hypsizygus ulmarius
Fungi Partly documented

Hypsizygus ulmarius

Elm oyster

The elm oyster fruits from wounds and scars on living elm, box elder and beech, often high on the trunk. Despite its name it is not a true oyster mushroom, but it grows on the same substrates, and kits are sold commercially. It is a cool-season fruiter in temperate forests of North America, Europe and Asia.

Hypsizygus ulmarius
Photo: Susulyka, CC BY-SA 3.0, via Wikimedia Commons
At home, aim for
Day Cool-growingTargets in Plantistry
Night Close to the dayTargets in Plantistry
Humidity Very humid airBand in Plantistry
Light Dappled lightDLI and PPFD in Plantistry
Expects a seasonal rest

Where it grows wild

Colonises dead or damaged wood on living trees, mostly elm, box elder and beech, fruiting from wounds high on the trunk.

Mostly lowland; recorded at 0–1735 m (median 241 m).

North AmericaEuropeAsia

🔒 Growing it like that

The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:

✓ Day and night temperature targets, and the limits it tolerates
✓ Humidity band, and how to hold it
✓ Light as DLI and PPFD for a grow light
✓ Wet and dry seasons, and whether to rest it
✓ Substrate and airflow
✓ A step-by-step setup to grow it like the wild

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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.