Judson Carroll wrote: It ismore important to knowwhat is toxic than what is tasty.
I have attended forays in NZ organised by the Fungal Network of NZ where the focus is on collecting, identifying and data basing NZ specimens, however, if one’s interest is in edible species, I found it much more useful to learn to be confident in identifying the edibles by learning the environment that they grow in, the trees that they are most likely associated with etc.
There are very few truely poisonous fungi, many that are edible but not worth eating so personally, learning the edible species has been much more useful to me.
On the forays that we attended in Wales, we carried two baskets, one for the definitely edible species and another for ones that we would identify when we went back to the b&b.
We would sort and clean the edibles so that they could cooked for our evening meal then go through the other basket identifying them.
Aminita phalloides are the most notorious of the poisonous fungi, however the classic aminita muscaria although hallucinogenic is commonly consumed in Eastern Europe after boiling to remove the toxins.
Some people cannot consume stropharia rugosoannulata (wine caps) or Coprinopsis atramentaria (ink caps) with alcohol as they can make them very ill.
For me, learning to confidently identify edible species of fungi has been most useful, rather than worrying about what could kill me.
If in doubt, I keep the specimens separate for later identification but wouldn’t consume them.