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Nisekurohatsu
A deadly East Asian brittlegill that causes rhabdomyolysis (breakdown of skeletal muscle), a type of mushroom poisoning rarely seen with other species. The toxin was identified in 2009 as cycloprop-2-ene carboxylic acid. It belongs to the group of blackening Russulas, and the name 'charcoal mushroom' is shared with edible relatives in parts of Asia.
Deadly. Cycloprop-2-ene carboxylic acid causes rhabdomyolysis: early vomiting and diarrhoea, then muscle pain and weakness, dark urine, kidney injury, high potassium and heart effects; most deaths occur 12-24 hours after eating. In a Thai series of suspected Russula myotoxic poisoning, 11 of 41 patients died. Patients there called the mushrooms 'charcoal mushrooms', a name also used for edible R. nigricans and R. densifolia. A mild taste does not rule it out.
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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 Entries are compiled from cited sources and reviewed, but may be incomplete or out of date — check the sources, and never rely on this library alone to identify or eat a mushroom.
