For Emergency Physicians, Toxicologists, EMS & Poison Control
This guide covers the five most dangerous toxic mushroom species and species complexes in the Arctic and Tundra biome — tundra heath communities, dwarf shrub zones, treeline transition corridors, and river valley forest patches across Nunavut, the Northwest Territories, and Yukon. Each entry includes toxin class, clinical course, treatment protocol, and Arctic-specific notes on hypothermia mimicry and remote medevac prioritization.
The Arctic presentation of mushroom toxidrome is complicated by two compounding factors not present in southern clinical environments: (1) sub-zero ambient temperatures that accelerate dehydration, derangement, and hypothermia concurrently with the toxidrome, and (2) extreme remoteness that places dialysis, liver transplant, and tertiary care hours to days away from the patient. Initiate full protocol on clinical suspicion — do not wait for lab confirmation in remote presentations.
| Species | Toxin Class | Onset | Tier |
|---|---|---|---|
| Galerina marginata (Deadly Galerina) | Amatoxins | 6–24 h (GI); 48–96 h (hepatic) | TIER 1 |
| Cortinarius spp. — Orellanine Webcap group | Orellanine | 3–14 days | TIER 1 |
| Gyromitra esculenta / Gyromitra infula (False Morel) | Gyromitrin / MMH | 6–12 h | TIER 2 |
| Inocybe spp. — Arctic Inocybe Complex | Muscarine | 15–30 min | TIER 2 |
| Amanita muscaria (Fly Agaric) | Ibotenic acid / Muscimol | 30 min – 2 h | TIER 3 |
| Lycoperdon / Bovista spp. (Immature Puffballs) | Variable / Amanita button confusion | Variable | TIER 3 |
⚠ TIER 1 — LIFE-THREATENING
Deadly Galerina
Galerina marginata
Toxin
Amatoxins (alpha-amanitin)
Lookalike
Edible wood-decaying mushrooms, Pholiota species, hallucinogenic Psilocybe species
Three-Phase Amatoxin Clinical Course
Phase 1 — Violent secretory diarrhea and cramping 6–24 hours.
Phase 2 — False recovery 24–48 hours with rising AST/ALT and INR; patient feels improved just before organ failure begins.
Phase 3 — Fulminant hepatic necrosis, coagulopathy, renal failure day 3–5.
Phase 1 — Violent secretory diarrhea and cramping 6–24 hours.
Phase 2 — False recovery 24–48 hours with rising AST/ALT and INR; patient feels improved just before organ failure begins.
Phase 3 — Fulminant hepatic necrosis, coagulopathy, renal failure day 3–5.
Treatment Protocol
Aggressive IV fluid resuscitation. Multi-dose activated charcoal to interrupt enterohepatic circulation. IV Silibinin if available. NAC protocol. Repeat LFTs and INR every 6–8 hours. Early hepatology consult. Liver transplant evaluation.
Regional Referral: University of Alberta Hospital Liver Transplant Team.
Aggressive IV fluid resuscitation. Multi-dose activated charcoal to interrupt enterohepatic circulation. IV Silibinin if available. NAC protocol. Repeat LFTs and INR every 6–8 hours. Early hepatology consult. Liver transplant evaluation.
Regional Referral: University of Alberta Hospital Liver Transplant Team.
NAC Pediatric Protocol — Arctic Cold-Climate Pathophysiology Note
Severe GI fluid loss combined with arctic cold triggers rapid peripheral vasoconstriction that masks early shock signs while accelerating core hypovolemic collapse — IV fluids must be delivered via active blood warmer in Arctic field settings.
Severe GI fluid loss combined with arctic cold triggers rapid peripheral vasoconstriction that masks early shock signs while accelerating core hypovolemic collapse — IV fluids must be delivered via active blood warmer in Arctic field settings.
Contraindications
Antimotility agents and NSAIDs are explicitly contraindicated.
Antimotility agents and NSAIDs are explicitly contraindicated.
Hypothermia Mimicry Note
Secretory toxidrome causes profound dehydration compounded by sub-zero ambient exposure. Secondary hypothermia is a primary driver of cardiac arrest before organ failure in Arctic presentations — assess and treat hypothermia concurrently with amatoxin protocol.
Secretory toxidrome causes profound dehydration compounded by sub-zero ambient exposure. Secondary hypothermia is a primary driver of cardiac arrest before organ failure in Arctic presentations — assess and treat hypothermia concurrently with amatoxin protocol.
Remote Arctic Medevac Note
Initiate full amatoxin protocol immediately on clinical suspicion — do not wait for lab confirmation. Dialysis and transplant are not available in most northern health centres.
Initiate full amatoxin protocol immediately on clinical suspicion — do not wait for lab confirmation. Dialysis and transplant are not available in most northern health centres.
Medevac Prioritization Matrix
Immediate evacuation: any Phase 2 or Phase 3 presentation, rising INR, AST/ALT above 3× normal, altered mental status.
Urgent flight upgrade: INR above 1.5, creatinine rising, urine output below 0.5 mL/kg/hr.
Delayed evacuation logistics: document ingestion time, specimen photos, all lab values to date before transfer.
Immediate evacuation: any Phase 2 or Phase 3 presentation, rising INR, AST/ALT above 3× normal, altered mental status.
Urgent flight upgrade: INR above 1.5, creatinine rising, urine output below 0.5 mL/kg/hr.
Delayed evacuation logistics: document ingestion time, specimen photos, all lab values to date before transfer.
Cortinarius species — Orellanine Webcap group
Cortinarius spp. (Orellanine-producing)
Toxin
Orellanine (nephrotoxin)
Lookalike
Edible Cortinarius species misidentified in tundra heath and dwarf shrub communities
Onset
3–14 days (extreme diagnostic delay)
Symptoms
Intense thirst, burning mouth, lumbar pain, oliguria, progressive irreversible renal failure.
Intense thirst, burning mouth, lumbar pain, oliguria, progressive irreversible renal failure.
Treatment
Nephrology consult. Serial creatinine monitoring. Hemodialysis or CRRT. Monitor for permanent renal failure.
Nephrology consult. Serial creatinine monitoring. Hemodialysis or CRRT. Monitor for permanent renal failure.
Clinical Note — Mandatory Dietary History
Full two-week dietary history mandatory — patients never connect symptoms to mushroom ingestion at this delay.
Full two-week dietary history mandatory — patients never connect symptoms to mushroom ingestion at this delay.
Hypothermia Mimicry Note
Oliguric renal failure combined with sub-zero exposure accelerates metabolic derangement. Assess core temperature on every presentation.
Oliguric renal failure combined with sub-zero exposure accelerates metabolic derangement. Assess core temperature on every presentation.
Medevac Early Note
Dialysis is not available in most northern health centres — initiate medevac before renal failure is fully established.
Dialysis is not available in most northern health centres — initiate medevac before renal failure is fully established.
⚠ TIER 2 — SERIOUS
False Morel
Gyromitra esculenta / Gyromitra infula (False Morel)
Toxin
Gyromitrin → monomethylhydrazine (MMH)
Lookalike
True Morel (Morchella species) — the single most dangerous lookalike confusion in northern Canada. Peak risk May–June in tundra transition zones and river valleys.
Field Key — Three Points to Distinguish False Morel from True Morel
- Cap surface — False Morel has irregular brain-like folds and saddle shape. True Morel has regular honeycomb pits with vertical ridges.
- Stem attachment — False Morel cap hangs loosely at edges. True Morel cap is fully attached to stem all the way down.
- Interior — slice lengthwise. False Morel is cottony and chambered. True Morel is completely hollow stem to cap.
Symptoms
GI phase 6–12 hours, followed by hemolytic anemia, methemoglobinemia, hepatic failure, seizures.
GI phase 6–12 hours, followed by hemolytic anemia, methemoglobinemia, hepatic failure, seizures.
Hemolysis Monitoring — Inuit Dietary Context
Note: Inuit iron-rich country food diet (seal, walrus, caribou) alters baseline hemolysis monitoring thresholds — standard reference ranges may not apply.
Note: Inuit iron-rich country food diet (seal, walrus, caribou) alters baseline hemolysis monitoring thresholds — standard reference ranges may not apply.
Treatment
Pyridoxine (Vitamin B6) IV — adult 25 mg/kg with strict 5 g ceiling; pediatric 25 mg/kg with 2.5 g ceiling.
Methylene blue for methemoglobinemia. Liver transplant evaluation in severe cases.
Pyridoxine (Vitamin B6) IV — adult 25 mg/kg with strict 5 g ceiling; pediatric 25 mg/kg with 2.5 g ceiling.
Methylene blue for methemoglobinemia. Liver transplant evaluation in severe cases.
Antidote Sub-Zero Cache Protocols
Pyridoxine must be stored between 15–30°C — never freeze. Use chemical warmers in field medical bags. Silibinin reconstitution requires water above 10°C — pre-warm diluent before use in sub-zero field conditions.
Pyridoxine must be stored between 15–30°C — never freeze. Use chemical warmers in field medical bags. Silibinin reconstitution requires water above 10°C — pre-warm diluent before use in sub-zero field conditions.
Cultural Context
Inuit and Dene communities harvest True Morels in river valley transition zones. Non-local harvesters, researchers, and eco-tourists are at highest risk for misidentification.
Inuit and Dene communities harvest True Morels in river valley transition zones. Non-local harvesters, researchers, and eco-tourists are at highest risk for misidentification.
Hypothermia Mimicry Note
MMH toxidrome causes vomiting and diaphoresis — accelerates heat loss in sub-zero conditions. Monitor core temperature throughout treatment.
MMH toxidrome causes vomiting and diaphoresis — accelerates heat loss in sub-zero conditions. Monitor core temperature throughout treatment.
Inocybe species — Arctic Inocybe Complex
Inocybe lacera · Inocybe rimosa · Inocybe geophylla · Inocybe dulcamara complex
Toxin
Muscarine
Onset
15–30 minutes
Species Notes
Inocybe lacera (Torn Fibercap) is the dominant High Arctic species — mycorrhizal with dwarf willow and dwarf birch above the treeline. I. rimosa and I. geophylla also present in tundra moss and lichen communities.
Lookalike
Edible field mushrooms foraged in tundra openings and moss meadows
Symptoms — Full SLUDGE Syndrome
Salivation, Lacrimation, Urination, Defecation, GI distress, Emesis — plus bradycardia, bronchospasm, severe miosis.
Salivation, Lacrimation, Urination, Defecation, GI distress, Emesis — plus bradycardia, bronchospasm, severe miosis.
Treatment
Atropine 0.5–2 mg IV titrated to drying of bronchial secretions only — not heart rate or pupil size. Airway management if bronchospasm is severe.
Atropine 0.5–2 mg IV titrated to drying of bronchial secretions only — not heart rate or pupil size. Airway management if bronchospasm is severe.
Atropine Ceiling Note
Titrate to secretions only. Over-titrating based on tachycardia or pupil size causes independent harm.
Titrate to secretions only. Over-titrating based on tachycardia or pupil size causes independent harm.
Arctic Exposure Protocol
Strip wet clothing immediately. Place patient in dry hyper-insulated exposure bag during treatment. Muscarine-driven diaphoresis combined with wet clothing in sub-zero conditions is rapidly fatal independent of the toxidrome.
Strip wet clothing immediately. Place patient in dry hyper-insulated exposure bag during treatment. Muscarine-driven diaphoresis combined with wet clothing in sub-zero conditions is rapidly fatal independent of the toxidrome.
Hypothermia Mimicry Note
Bradycardia and altered consciousness from muscarine toxidrome are clinically indistinguishable from moderate hypothermia — assess and treat both simultaneously.
Bradycardia and altered consciousness from muscarine toxidrome are clinically indistinguishable from moderate hypothermia — assess and treat both simultaneously.
ⓘ TIER 3 — MODERATE
Fly Agaric
Amanita muscaria
Toxin
Ibotenic acid / Muscimol
Habitat
Treeline transition zones and river valley forest patches
Onset
30 minutes – 2 hours
Symptoms
CNS depression and stimulation cycling — confusion, delirium, ataxia, stupor.
CNS depression and stimulation cycling — confusion, delirium, ataxia, stupor.
Treatment
Supportive. Benzodiazepines for agitation or seizures. DO NOT administer Atropine.
Supportive. Benzodiazepines for agitation or seizures. DO NOT administer Atropine.
Outdoor Stupor Note — Arctic-Specific
A patient who becomes stuporous outdoors in Arctic conditions faces near 100% mortality from freezing before toxidrome resolution. Any Amanita muscaria ingestion with altered mental status requires immediate indoor shelter and monitoring — do not leave patient unattended outside under any circumstances.
A patient who becomes stuporous outdoors in Arctic conditions faces near 100% mortality from freezing before toxidrome resolution. Any Amanita muscaria ingestion with altered mental status requires immediate indoor shelter and monitoring — do not leave patient unattended outside under any circumstances.
Traditional Use Note
Historical ceremonial and traditional use documented among some Siberian and subarctic Indigenous communities — relevant for clinical history taking. Inuit traditional knowledge includes tupiliuyait and puvirlat terminology for psychoactive fungi.
Historical ceremonial and traditional use documented among some Siberian and subarctic Indigenous communities — relevant for clinical history taking. Inuit traditional knowledge includes tupiliuyait and puvirlat terminology for psychoactive fungi.
🐕 Veterinary Note — Sled Dogs & Working Dogs
Sweet amino acid attractant — sled dogs and working dogs in Arctic communities target these specifically. Quiet sensory-deprived boarding, respiratory support, excellent prognosis after 24–48 hours. Canine decontamination window: gastric lavage or activated charcoal must be initiated within 2–4 hours post-ingestion — useless after GI phase settles.
Sweet amino acid attractant — sled dogs and working dogs in Arctic communities target these specifically. Quiet sensory-deprived boarding, respiratory support, excellent prognosis after 24–48 hours. Canine decontamination window: gastric lavage or activated charcoal must be initiated within 2–4 hours post-ingestion — useless after GI phase settles.
Lycoperdon and Bovista species (Immature Puffballs)
Lycoperdon spp. · Bovista spp.
Field Safety Check
Slice lengthwise — solid uniform white interior confirms true puffball. Any internal structure indicating a developing cap, stem, or gills indicates an embryonic Amanita button — do not eat.
Slice lengthwise — solid uniform white interior confirms true puffball. Any internal structure indicating a developing cap, stem, or gills indicates an embryonic Amanita button — do not eat.
Inuit Historical Use
Puffballs have been used historically as wound hemostatic agents and fire tinder in Inuit communities. Poisonings are almost exclusively non-local researchers, mining camp personnel, and eco-tourists misidentifying immature specimens.
Puffballs have been used historically as wound hemostatic agents and fire tinder in Inuit communities. Poisonings are almost exclusively non-local researchers, mining camp personnel, and eco-tourists misidentifying immature specimens.
Sample Preservation Checklist
- Wrap in paper or foil — never plastic
- Refrigerate immediately — do not freeze
- Preserve entire specimen including base and any cup structure
- Document collection coordinates and nearest community or landmark
- In remote communities photograph specimen against a ruler before any handling
☎ Emergency Contacts — Arctic & Tundra
1-800-661-0845
Nunavut — Nunavut Health Line
1-888-255-1010
Northwest Territories — NWT Health Line
1-867-667-8726
Yukon — Yukon Poison Control
1-800-268-9017
National Backup Poison Control
Regional Liver Referral: University of Alberta Hospital Liver Transplant Team — initiate contact on any Phase 2 or Phase 3 amatoxin presentation or rising INR.