Blackening Russula
Russula subnigricans
deadly
Distribution
East Asia: Japan, China, Taiwan. Responsible for multiple fatal poisonings.
Habitat
Mycorrhizal with Fagaceae species in warm temperate to subtropical forests.
Season
Summer to autumn.
Toxin Type
Cycloprop-2-ene carboxylic acid
Symptoms
Causes rhabdomyolysis (muscle breakdown) leading to acute kidney failure and cardiac arrest. Unique toxin mechanism distinct from all other mushroom poisons. Multiple deaths in Japan.
User Reported Vision
Blackening russula patterns spread like ink stains. Everything darkened and blackened. I saw blackening spirits consuming the light.