It doesn't - which is why a lot of people get sick in Sweden every year and it's heavily skewed to people who aren't Swedish. I'm not sure if it's because they lack knowledge entirely, or because the knowledge they had didn't transfer.

Few swedes would pick a white mushroom at all, and most would know that it at least shouldn't be white both on top and underneath because that's deadly.

That fits me, I just wrote a comment saying that while I feel very comfortable picking the standard 2-4 mushrooms in Sweden I would never try and pick a white one even if know we have some edible species.