 A study of the mineral contents of various edible mushrooms found that C. micaceus contained the highest concentration of potassium in the 34 species tested , close to half a gram of potassium per kilogram of mushroom . Because the species can bioaccumulate detrimental heavy metals like lead and cadmium , it has been advised to restrict consumption of specimens collected from roadsides or other collection sites that may be exposed to or contain pollutants . 
