Poisonous mushrooms in Ontario: the look-alikes behind magic mushroom mix-ups

This is a poisoning-prevention article, not an identification guide. It names the dangerous mushrooms that official, academic and mycological sources document in Ontario and Canada, explains why mix-ups with magic mushrooms happen and why the delay before symptoms is so dangerous, and says who to call. It does not describe how any mushroom looks or how to tell species apart, and no page on this site can make a wild mushroom safe. It is general information, not medical advice, and does not replace a poison centre, a doctor or 911. For the broader limits of names, photos and lab results, read our guide to magic mushroom safety and misidentification.

Why do magic mushroom mix-ups happen?

Because looking for one kind of wild mushroom means handling many others. Health Canada’s page on magic mushrooms says it is possible for people to consume poisonous mushrooms, mistaking them for magic mushrooms (Health Canada). A 2014 review in the Journal of Medical Toxicology is more specific: it says foragers seeking hallucinogenic mushrooms occasionally misidentify mushrooms and eat other, more toxic ones, which can result in delayed symptoms and possibly organ failure (Graeme, 2014).

Several things make errors easy. The same review notes that roughly 100 known mushroom species are poisonous to humans, that new toxic species continue to be identified, and that some species once classed as edible were later reclassified as toxic (Graeme, 2014). A 2026 report from the US Centers for Disease Control and Prevention on an amatoxin outbreak in northern California says poisonous mushrooms often resemble, and are difficult to distinguish visually from, edible ones (Brandecker et al., 2026). The Ontario Poison Centre’s position is that only a mushroom expert, called a mycologist, can tell poisonous from non-poisonous mushrooms (Ontario Poison Centre).

The line between “magic” and “poisonous” is not always clean either. A 2021 review of the genus Inocybe reports that it contains toxic substances including muscarine, psilocybin and psilocin (Patocka et al., 2021). For background on the term itself, see the look-alike mushrooms entry in our glossary.

Which poisonous mushrooms are on record in Ontario?

Ontario has no official list of poisonous mushrooms that we could find, so this section combines two kinds of evidence: medical and scientific sources on what a species contains, and public biodiversity databases on where the name has been recorded. The Global Biodiversity Information Facility (GBIF) gathers museum specimens and public observations; iNaturalist holds photo observations. A database record shows the name a specimen or photo was filed under, not a checked identification, and some records are decades old. The counts below were read from each database on 17 October 2026.

Sources for the table: the amatoxin content of Galerina marginata comes from a 2021 study of Galerina collected in western British Columbia, which found amatoxins in every sample of the G. marginata group it tested and none in the other Galerina samples (Landry et al., 2021). The lists of amatoxin-containing species, which include Amanita bisporigera, Galerina and Conocybe filaris, come from the StatPearls clinical reference, which also names the death cap as the species associated with the most fatalities (Horowitz and Moss), and from the 2014 review, which says Inocybe and Clitocybe species can contain enough muscarine to cause muscarinic poisoning (Graeme, 2014). Record counts come from GBIF (Galerina marginata; Amanita bisporigera). Names in this group are unsettled: GBIF also holds 19 Ontario records under the related name Pholiotina rugosa, which it files as Conocybe rugosa.

These are not only database entries. The North American Mycological Association’s 2011 poisoning report quotes a physician running a US amatoxin treatment study, who listed Windsor, Ontario, among the places where patients were enrolled that year; the same report counts three Galerina amatoxin cases in North America that year, one of them fatal (NAMA, 2011). Outside Ontario, a 2021 teaching note from the emergency department in Saint John, New Brunswick, describes a patient who ate wild white mushrooms she believed were safe, and says Amanita virosa, another destroying angel, is commonly found in New Brunswick and Nova Scotia (Department of Emergency Medicine, Saint John, 2021).

The fly agaric, Amanita muscaria, is a separate case: it is not an amatoxin mushroom but causes what the 2014 review calls an inebriating syndrome, from ibotenic acid and muscimol (Graeme, 2014). Our article on the fly agaric and Santa, listed under further reading, covers its history.

Are there death cap mushrooms in Ontario?

We found no evidence of an established death cap population in Ontario, and we could not rule one out. The death cap is a European species introduced to North America. A 2010 study using herbarium specimens, distribution models and field collections described two distinct North American ranges: one along the West Coast, from California to British Columbia, and one on the East Coast, from Maryland to Maine (Wolfe et al., 2010). Ontario is in neither.

In Canada, the documented problem is in British Columbia. HealthLinkBC calls death caps an invasive species introduced to the province from imported European trees, found mostly in urban areas on Vancouver Island and the Lower Mainland. It says that in 2016 a young child in B.C. died after eating harvested wild mushrooms, and that death caps can be mistaken for species that are safe to eat (HealthLinkBC).

What about the Ontario records? GBIF lists 12 preserved museum specimens from Ontario filed under the death cap’s name, most of them collected between 1902 and 1958 and the latest in 2008 (GBIF). iNaturalist had no death cap observation from Ontario, at any quality grade, when we checked (iNaturalist). Old records need care: a 2006 review of the death cap’s history in North America argues that confusion about where it grows is the direct result of shifting species concepts, and that early records with vague species concepts cannot settle the question (Pringle and Vellinga, 2006). We have not seen these specimens re-examined, so we treat them as names on file, not proof of death caps in Ontario today.

The practical point does not depend on the answer. Ontario does have amatoxin mushrooms on record, the destroying angels and Galerina marginata among them, and the poison-centre advice is the same whichever species is involved.

Liberty caps vs death caps

People search this pairing, but in Ontario’s public records neither is a common name. The liberty cap, Psilocybe semilanceata, had Canadian GBIF records from British Columbia and the Atlantic provinces but none from Ontario when we checked, and the death cap records are as described above. This article will not compare how the two look: the Ontario Poison Centre says only a mycologist can tell poisonous from non-poisonous mushrooms. Our article on whether magic mushrooms grow in Ontario covers which psilocybin species are on record here.

Why are delayed amatoxin symptoms so dangerous?

Because the person can feel fine while the toxin is already at work. The 2014 review describes four stages: a symptom-free latency, a gastrointestinal phase, an apparent recovery during which organ damage continues, and then acute liver failure or multi-organ failure. It says the symptom-free period typically lasts 6 to 24 hours before severe gastroenteritis, though shorter and longer latencies, up to 40 hours, have been reported; liver enzymes begin to rise 16 to 48 hours after eating; and hepatorenal or multi-organ failure follows within 2 to 7 days (Graeme, 2014). It also notes that children are particularly sensitive to amatoxin.

Sources: HealthLinkBC; Department of Emergency Medicine, Saint John, 2021; Graeme, 2014. HealthLinkBC adds that there is no known antidote for death cap poisoning, that a liver transplant may be needed if the liver fails, and that cooking, drying or freezing does not inactivate the toxin. The Ontario Poison Centre likewise says cooking outdoor mushrooms does not make them safe to eat.

Early symptoms are not a reliable all-clear either. The same review warns that using a quick onset, under six hours, to predict a mild outcome has limitations, and cites a case series in which 2 of 9 patients who went on to liver failure had first symptoms within six hours (Graeme, 2014). Muscarine poisoning from Inocybe or Clitocybe species, by contrast, usually starts 15 minutes to 5 hours after eating. Someone who mixed wild mushrooms could have more than one problem, which is why the timing of symptoms is for clinicians to interpret.

The stakes are high once the liver is involved. A study of the US Acute Liver Failure Study Group registry from 1998 to 2014 found 18 patients with amatoxin-related liver injury or failure. Of the 13 with acute liver failure, six survived without a transplant, five survived with one and two died without one; the authors concluded that around half of those presenting with liver failure may eventually need a transplant (Karvellas et al., 2016).

What should you do if someone may have eaten a wild mushroom in Ontario?

1. If the person is unconscious, not breathing or having a seizure, call 911. That is the instruction on the Canadian Association of Poison Centres and Clinical Toxicology site (CAPCC).
2. Otherwise call the Ontario Poison Centre right away on 1-800-268-9017, even if the person feels well. Its mushroom page says to call right away if you think someone has eaten a poisonous mushroom, and that illness may not start for many hours (Ontario Poison Centre). The centre is run by The Hospital for Sick Children (SickKids) in Toronto and answers 24 hours a day, every day of the year (Ontario Poison Centre home page).
3. 1-844-POISON-X (1-844-764-7669) and, in the Greater Toronto Area, (416) 813-5900 reach the same centre, which also serves Manitoba (CAPCC, Ontario Poison Centre).
4. Keep any of the mushroom that is left, and any photos. HealthLinkBC says to bring samples of the mushroom if possible, and otherwise photos and information about where it was collected (HealthLinkBC). The Saint John teaching note tells clinicians to ask for photos or samples and to call poison control with that information (Saint John, 2021). Don’t delay the call to find them.
5. Tell the poison centre or hospital if other people ate the same mushrooms, and when. That timing matters for the reasons above.

Being honest about what was taken helps the team treat the right problem. A poison centre’s job is medical, and the Shroomverse safety guide lists other Toronto and Ontario help lines.

Can a photo, an app, a colour or a smell test make a wild mushroom safe?

No. None of the official or medical sources we opened describes any home test as a way to clear a mushroom; their advice rests on expert identification and on calling a poison centre. Some specific points from the evidence:

• Apps. A 2026 study tested popular AI mushroom identification tools on more than 100 real-world photos of nearly 60 species. Even the best-performing tool failed in almost 15% of cases, and the authors concluded the apps cannot be trusted for life-or-death identification decisions (Kuznetsov et al., 2026).
• Blue bruising. The 2014 review says bluish bruising in psilocybin species is nonspecific, because some species without psilocybin bruise similarly (Graeme, 2014). Our guide to why magic mushrooms turn blue, in the further reading, explains the chemistry.
• Cooking. The Ontario Poison Centre says cooking does not make outdoor mushrooms safe; HealthLinkBC says cooking, drying or freezing does not inactivate death cap toxin.
• Photos and experience. The Ontario Poison Centre says only a mycologist can tell poisonous from non-poisonous mushrooms. Even specialists find some groups hard: the 2021 Galerina study calls the genus’s roughly 300 species notoriously difficult to identify by morphology (Landry et al., 2021).

Dried or packaged material is no safer a guess. Our article on fake magic mushroom products, in the further reading, shows how often labels on mushroom edibles were wrong in published tests.

What does this article leave out on purpose?

• Any feature, trait or test for telling mushrooms apart, including the death cap, destroying angels, Galerina or liberty caps. The Ontario Poison Centre’s position is that this needs an expert.
• Where these mushrooms grow in Ontario beyond province-level database counts, and anything about picking, preparing or eating wild mushrooms.
• Any statement that a mushroom, a name, a species record or a product is safe.

Shroomverse sells mushroom products. This article is general information about mushroom safety, misidentification and where to get help. It is not medical, legal or purchasing advice, and it does not encourage anyone to use drugs.