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Oyster Mushroom, Pearl Oyster, Hiratake
4 public strains
The oyster mushroom, a shelf-forming white-rot fungus of dead and dying hardwoods and one of the most widely cultivated edible mushrooms. In North America it fruits mainly in cold weather, from late fall to early spring, which helps separate it from the warm-season P. pulmonarius.
Choice edible, best picked young (older caps become tough). Toxic look-alikes: Omphalotus olivascens (western jack-o'-lantern) and Clitocybe dealbata in North America, Omphalotus nidiformis in Australia, and Lentinellus species (jagged gill edges, hairy caps). Confirm decurrent gills, a white-lilac spore print and growth on wood.
Spawn rate 10–20% of wet substrate weight. Fruiting trigger: Expose to fresh air, light and a modest temperature drop once colonized. Fresh air: High fresh air exchange; CO₂ buildup causes long stems and small caps. Light: Indirect light is needed for normally formed caps. Often 2–3 flushes with declining yields. Fruiting temperature preference is strain-dependent (cold- vs warm-weather strains). Colonization humidity is ambient RH around sealed bags and is not critical. Review: General ranges compiled from widely published cultivation practice. Pending WeMush staff review; conditions vary by strain and setup.
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Mycology is an evolving science: names, classifications and safety information change as research advances. Entries are compiled from cited sources and reviewed, but may be incomplete or out of date — check the sources, and never rely on this library alone to identify or eat a mushroom.
