This is exceedingly bad advice as there are several spongy mushrooms which are toxic in the US: Bolete Huronensis, Sutorius Eximius, Boletus Sensibilis to name

This is exceedingly bad advice as there are several spongy mushrooms which are toxic in the US: Bolete Huronensis, Sutorius Eximius, Boletus Sensibilis to name a few. There are a few in genus Leccinum as well.