Clitocybe acromelalga

Clitocybe acromelalga is a basidiomycete fungus of the large genus "Clitocybe" found in Japan. It was discovered to be poisonous in 1918, when symptoms of mushroom poisoning occurred within three days of consumption. It had been mistaken for the edible tawny funnel cap ("Paralepista flaccida" formerly "Lepista inversa").
Consumption of a related species, "C. amoenolens" from France has resulted in the same condition.