Liberty caps in the UK: how to recognise them and their deadly lookalikes

When is liberty cap season in the UK?

Liberty cap season in the UK runs from August to November, and most of them come up in autumn. That is the window our data shows for Great Britain, based on several thousand dated records.

They are a grassland mushroom, not a woodland one. You will see them in grazed fields, rough pasture, upland grass and moorland, and now and then on lawns and in parks. They live on dead grass roots, so they do not grow on dung itself.

Autumn is also when many other small brown mushrooms appear in the same grass. That overlap is the reason this guide spends more time on lookalikes than on the liberty cap itself.

Liberty cap size: how small they are, and why small ones are hard to name

A liberty cap is tiny. The cap is about 0.5 to 2 cm across, and the stem is 4 to 10 cm tall but only 2 to 3 mm thick. In long grass it is easy to miss altogether.

Small liberty caps are the hardest to identify. Young ones have pale olive-grey gills that have not yet turned purple-black, so the most useful colour check is not there yet. A small, pale mushroom in grass could belong to several genera.

If a mushroom is too young to show its gill colour clearly, treat it as unidentified. Size alone tells you nothing about safety.

Liberty cap identification: gills, spore print and four other checks

To identify a liberty cap you need all of these together, not just one. A cone-shaped or bell-shaped cap with a distinct pointed tip. A cap that is cream to olive-brown, with fine lines running in from the edge. A long, thin, often wavy stem with no ring. A home in open grass.

Then look at the gills. Liberty cap gills start olive-grey and turn purple-black as the spores ripen. A spore print settles it: a liberty cap leaves a very dark purple-brown print. Rusty, yellow-brown or snuff-brown spores mean a different genus, and some of those are deadly.

If even one check fails, it is not a liberty cap. And if every check passes, you have a name, not a reason to eat it. Wash your hands after handling any wild mushroom. Our liberty cap card has photos of each feature.

Liberty cap lookalikes in UK grassland, including deadly ones

The most common liberty cap lookalike in the UK is the brown mottlegill (Panaeolina foenisecii) of mown lawns and verges. It is not edible. It is usually larger, with no pointed tip on the cap, and its gills look blotchy as they darken. Its spore print is dark brown rather than purple-brown.

The dangerous ones are small brown conecaps and Galerina species that contain amatoxins, the same liver toxins as the death cap. The conecap Pholiotina rugosa (also listed as Conocybe filaris) has rusty gills, a yellow-brown spore print and a ring on the stem. In Britain it is uncommon to rare and grows on leaf litter, garden compost and mossy ground, which can be close to a lawn. The funeral bell (Galerina marginata) grows on wood and also has a ring. A liberty cap never has a ring.

Poisonings from mix-ups are on record. The white fibrecap (Inocybe geophylla) can be mistaken for small grassland mushrooms and causes muscarine poisoning. In Austria, a young man looking for magic mushrooms ate the deadly webcap (Cortinarius rubellus) by mistake, and his kidneys failed permanently.

Not finding a recorded UK case for a particular lookalike does not make it safe. If you are unsure which of these you are looking at, assume it could be one of the deadly ones.

Liberty cap vs death cap: two very different mushrooms

A liberty cap and a death cap look nothing alike. The death cap (Amanita phalloides) is a large woodland mushroom with a cap 5 to 15 cm across, white gills, a white spore print, a ring and a white bag around the swollen base. It grows with trees, especially oaks, from July to November.

The real link between them is the toxin. The death cap causes most fatal mushroom poisonings in Europe, and the small conecaps described above carry the same kind of toxin in a liberty cap sized body. That is why the brown or rusty spore print matters far more than the size.

So never judge a small brown mushroom by its size or by how harmless it looks. Any suspected case of eating one needs a doctor straight away, even if the person feels fine.

Are liberty caps illegal in the UK?

Yes. Across the UK, any fungus that contains psilocin is a Class A drug under the Misuse of Drugs Act 1971. Since the Drugs Act 2005, fresh mushrooms have been treated the same as dried or prepared ones.

The law in England, Wales, Scotland and Northern Ireland makes an exception for mushrooms growing wild, and for picking them only to destroy them or hand them to someone lawfully allowed to take them. Picking them to keep counts as possession. The maximum penalty for possessing a Class A drug is 7 years in prison, and for supplying it, even to friends, life.

For how this fits with the general rules on picking wild mushrooms, see our guide to foraging ethics and the law.

Are liberty caps safe to eat? What to do if someone has eaten a wild mushroom

No, liberty caps are not safe to eat. They are poisonous, and First Nature notes that some people have needed hospital treatment after eating them, with vomiting, stomach pains and anxiety attacks. The bigger risk is a wrong identification, because the lookalikes can destroy the liver or kidneys.

If you think someone may have eaten a harmful mushroom, call 999 straight away, even if they feel fine.

Take the mushroom, or what is left of it, to show the doctors. Do not try to make the person sick, and do not give them anything to eat or drink. For symptoms by toxin type, read our mushroom poisoning first aid guide.