 This low frequency may be attributed to the mushroom's nondescript appearance as a "little brown mushroom" leading to it being overlooked by collectors, and by the fact that 21% of amatoxin poisonings were caused by unidentified species.The toxicity of certain "Galerina" species has been known for a century.In 1912, Charles Horton Peck reported a human poisoning case due to "G. autumnalis".