Fubar there are many many many toxic species in the UK.
ALL inocybes must be avoided, most are full of muscarine, not tiny quantities like fly agaric, but many, esp. I.patillouardii (red stainer) and I.napipes are the most toxic in this genus but no inocybe should ever be eaten. NONE of them, most are poisonous, the two I mentioned contain the highest level of muscarine.
Cortinarius spp. Those in the subgenus Leprocybe (or is it Dermocybe, I forget) such as C.speciosissimus, C.gentilis, C.orellanus, contain a slow-acting nephrotoxin, orellanine, and it can take up to a month for signs of toxicity to show.
Amanitas-some contain amatoxins, these are those related to the deathcap (A.phalloides) as well as A.verna (spring amanita, fool's mushroom) amd A.virosa. There are also nephrotoxic species in the Amanita family, such as A.smithiana, possibly A.echinocephala. A.proxima A/sphaerobulbosa. and A.pseudophorphyria (toxins chlorocrotylglycine, allenic norleucine [2-amino-4,5-hexadienoic acid])
Conocybes, Galerinas, many of the small Lepiotas contain amatoxins also,
Sulfur tuft (Hypholoma fasciculare) contains some amatoxins plus a bunch of nasty ass shit called fasciculols, caused liver failure, neurologic symptoms, possibly blindness)
Tricholoma ustale is highly toxic, common cause of mushroom posoning in japan. T.pardinum is possibly present in britain, but if so very rare, very violent but unlikely to be fatal, gastrointestinal tox.
Clitocybe dealbata, C.rivulosa, muscarine, lots of it, deadly.
C.nebularis-clouded agaric can be toxic to some people but not all.
Gyromitra (false morels) contain gyromitrin, a precursor to monomethylhydrazine, also known as lorchels, the toxin inhibits GABA synthesis via fucking up the vitamin B6 pathway.
Some coprinus such as C.atrementarius (common ink cap) act like antabuse/disulfiram, nonlethal but will make you so sick you will wish you were dead if you drink whilst on it, does the same thing as metronidazole, and disulfiram, inhibits aldehyde dehydrogenase)
Paxillus involutus/brown roll rim can cause a delayed autoimmune haemolysis, was considered safe for a long time, but eventually causes an autoimmune reaction, allergy to a complex sugar thingy in it, and then once the toxicity occurs, it bursts red blood cells, fucking up kidneys and of course impeding oxygen transport.
Some Boletus can be deadly, the B.satanas clade, such as B.satanas, B.satanoides, B.rhodoxanthus, don't eat red pored boletes, most are toxic, thw roxin in B.satanas is called bolesatine, its a cytotoxic lectin, like ricin, violent GI irritant, not usually lethal but can be.
B.pulcherrimus, toxin I don't know.
Purple dye polypore-toxin is polyporic acid, delayed fulminant encephalohapy
Pleurocybella porrigens (angel wing) contains an unstable toxin, pleurocybellaziridine, lethal to those with kidney impairment especially, causes fulminant, fatal encephalopathy
Podostroma cornu-damae a japanese nasty, contains trichothecene mycotoxins such as T2 toxin, many toxic effects, has a relative in the UK that looks like hare's ear, but grey, don't know if its toxic but don't eat it, guilty by association. as little as a half gram has killed people (1g was enough to kill two people) compared to the deathcap (Amanita phalloides) which can take about 50g to kill.
Ergots are useful for producing LSD precursors, but themselves, no chemistry done on/with them, they cause hallucinatory effects, convulsions and gangrene, fatal. Complex mixture of toxins but mostly ergopeptides like ergotamine, which are powerful vasoconstrictors. Claviceps paspali also contains paspalitrem, a tremorogenic mycotoxin.
There's also Neotyphodium lolii, produces tremorogenic toxins, plus ergovaline, an ergoteptid.
Tricholoma equestre-needs multiple meals to poison, eaten within a short time, about a week, contains some nasty stuff that causes rhabdomyolysis, formerly considered a good edible. Russula subnigricans also rhabdomyolysis, toxin I think is cycloprop-2-ene-carboxylic acid.
Blusher (haemolyic poison, rubescenslysin, edible if twice cooked throwing water away each time and changing for fresh water then cook again as desired for your meal)
Amanita pantherina contains not only muscimol/ibotenic acid (the latter decarboxylates with heat into muscimol) but also contains some EXTREMELY powerful excitotoxins, stizolobic and stizolobinic acid)
Clitocybe acromelalga and C.amnoelens contain acromelic acids, kainate receptor-agonist excitotoxins, causes a severely painful neuropathy that can last for years, even as long as a decade, pain relieved temporarily by immersing area in cold water, not usually lethal)
There ya go, a list of the worst offenders of the bunch.
Omphalotus spp-extremely rare, glow in the dark, not deadly but most unpleasant GI toxicity, toxins are the illudins, related to a toxin found in male fern and bracken, ptaquiloside, bracken also contains cyanide and thiaminases, enzymes that are thermostable and destroy vitamin B1 (thiamine) in the body) these ferns, incidentally, are lethally toxic/ The ptilaquoside and presumably the illudins are extremely carcinogenic and nasty ass neurotoxins.
Also Entoloma sinuatum, not always lethal but can be, rapid onset of poisoing, toxin unknown, mode of action primarily GI, but neurological symptoms also. Really, really really nasty fuckin' customer.
And there are plenty plenty fungi that whilst not lethal will make you sick as hell.
Yours mycotoxicologically,
the Limpet Chicken
