Same thing happened in Slovenia to some illegal migrants who tried to live off the land while making their way further into Europe: they picked up mushrooms that looked a lot like a safe species in their home country but was in fact highly poisonous. I believe at least some died.

The general rule here is that you only ever pick mushroom species somebody has thoroughly introduced you to - books and "I think we ate those at our friends house the other day" are considered quite reckless.