Question: What percentage of mushrooms can be dangerous

David Walker-Sünderhauf answered on 6 Mar 2019:

I didn’t really know this, but am a bit interested in mushrooms (my granddad used to take me walking through the woods and always knew which mushrooms were safe and which ones weren’t) so I did a quick internet search – it looks like ~20% of mushrooms can make you sick, but only a few of these are actually deadly.
Obviously it’s really important to actually know what you’re doing when foraging mushrooms – I sadly wouldn’t trust myself to do it.

One of my favourite sayings is this Croatian proverb: “All mushrooms are edible, but some only once.”