Here I use KOH (Potassium Hydroxide 10% w/v) to help differentiate edible vs toxic Agaricus species. Most likely this is part of the #YellowStainer #Agaricusxanthodermus group. This is common field mushroom growing saprobically in the grass, related to Button/Crimini mushrooms you buy in the store. Some Agaricus species can be delicious, but if they stain yellow with KOH or when handled and they smell like phenol (disinfectant), this type can lead severe gastrointestinal upset when consumed (🤒�
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