Many years back, my daughter and I were out gathering wild food n' stuff and came across a cluster of fine-looking mushrooms we hadn't seen before. They looked gorgeous and we were gonna have a nibble, but thought it best to err on the side of caution. Instead, we popped them in their own bag and, with all the other stuff we'd collected, took them home.
An hour or two later we spread our harvest of differing fungi and herbs on the floor and started through the ID-books to check on the ones we didn't know. After a few minutes, my daughter cried, "That's it daddy!" - pointing to the cluster we'd gathered.
I started reading the info (I've still got the book, which is indispensable!), which told: "Amanita phalloides...This is most deadly fungus known & despite years of detailed research into the toxins it contains, no antidtoe exists against their effects on the human body"!
After I'd finished blurting out various expletives, gazing at this bunch of deadly miniatures, incredibly impressed by their tiny powers, I went out and bought several colour photographic guide-books on the toxic plants of Europe and beyond. My daughter and I spent several years identifying the deadly and toxic plants and fungi. I can't recommend it highly enough! Nature has somed incredibly awesome deadly creatures scattering this wondrous planet of ours - and most of us seek to know so little about them.
My point here? Get the best photographic poisonous plant guides*, aswell as Stamet's Psilocybin Mushrooms of the World.
Cheers - Megalithix
* for Europe, get Woodward's Poisonous Plants; North's Poisonous Plants & Fungi, etc.