Clinical Use Only. This reference is intended for emergency physicians, toxicologists, EMS personnel, poison control specialists, and other licensed healthcare providers responding to suspected mushroom toxicity cases. It is not a guide for foragers or laypersons. For active poisoning cases, contact 911 immediately for real-time case management support. Confirm all treatment decisions with current institutional protocols.
Regional Scope: Mexico’s Southern Cloud Forest region encompasses Oaxaca, Chiapas, and Veracruz — high-humidity montane ecosystems (1,000–3,000 m) dominated by pine-oak and Liquidambar (sweetgum) cloud forests. This region presents a unique dual-risk profile: amatoxin-producing Galerina marginata is critically confused with psychoactive Psilocybe species gathered for traditional ceremonial use, while Omphalotus species are routinely misidentified as the prized wild chanterelle. Pediatric poisoning from Panaeolus cyanescens represents an emerging emergency in rural areas bordering cattle pastures.
☎ Emergency Contacts — Mexico Region 2
Primary Human Poisoning — National Emergency
Línea nacional de emergencias: 911 — disponible 24/7 en todo México.
Regional Reference Center — Oaxaca
Hospital Regional de Alta Especialidad de Oaxaca (HRAEO) — centro de referencia para intoxicaciones graves en la Sierra Juárez y Valles Centrales. 911
Regional Reference Center — Chiapas
Hospital Regional de Alta Especialidad Ciudad Salud (Tapachula, Chiapas) — referencia para intoxicaciones en la Sierra Madre de Chiapas y Selva Lacandona. 911
Veterinary Emergency — Oaxaca
Veterinaria UABJO (Universidad Autónoma Benito Juárez de Oaxaca) — ingestión de hongos tóxicos en animales de compañía y ganado. 911
Veterinary Emergency — Veracruz
UV Veterinaria (Universidad Veracruzana) — toxicología veterinaria para la zona de bosque mesófilo de montaña veracruzano. 911
Quick Reference — All 5 Species
| Common Name | Scientific Name | Tier | Toxin | Onset | Primary Syndrome |
|---|---|---|---|---|---|
| Funeral Bell | Galerina marginata | Tier 1 | Amatoxins | 6–24 hr | Lethal hepatotoxicity |
| Fiber Cap | Inocybe geophylla | Tier 2 | Muscarine | 15–30 min | SLUDGE / autonomic crisis |
| Ivory Funnel | Clitocybe dealbata / rivulosa | Tier 2 | Muscarine | 15–30 min | SLUDGE / autonomic crisis |
| Blue Meanies | Panaeolus cyanescens | Tier 2 | Psilocybin / Psilocin | 20–60 min | Neurotropic / pediatric emergency |
| Jack-o'-Lantern | Omphalotus olivascens / olearius | Tier 2 | Illudins | 30 min–2 hr | Severe necrotizing gastroenteritis |
⚠ Tier 1 — Potentially Fatal
Amatoxin Species — Lethal Hepatotoxicity
Immediate emergency management required. Delayed presentation is characteristic — absence of early symptoms does not indicate safety. Initiate 911 consultation for any suspected Galerina ingestion. Critical lookalike confusion with psychoactive Psilocybe species in this region.
Funeral Bell
Galerina marginata (Batsch) Kühner
Tier 1 — Potentially Fatal
6–24 hr onset
Ecological Niche
Decaying wood and mossy logs in high-humidity pine-oak and Liquidambar cloud forests. Grows in dense clusters on rotting conifer and hardwood debris at cloud forest elevations (1,200–2,800 m) throughout Oaxaca and Chiapas.
Identification Features
Cap 1–4 cm, tawny-brown, hygrophanous (fades pale tan when dry); striate when moist; gills adnate to slightly decurrent, ochre-brown; fibrous ring (annulus) on stipe, often deteriorating; spore print rusty-brown.
Toxin Class
Amatoxins — cyclopeptides identical to those in Amanita phalloides. Alpha-amanitin inhibits RNA polymerase II causing irreversible hepatocellular necrosis.
Onset Timeline
6–24 hours latency period (asymptomatic) followed by severe GI phase (nausea, vomiting, cholera-like diarrhea), then apparent recovery, then fulminant hepatic failure at 3–5 days.
Lookalike Confusion Risk
⚠ Critical — Psilocybe confusion: Critically confused with wild neurotropic Psilocybe species (P. caerulescens, P. zapotecorum) due to identical small, brown, hygrophanous cap morphology. Galerina lacks bluing reaction and has a rusty-brown (not purple-brown) spore print. Foragers gathering for ceremonial use are at high risk of lethal substitution.
Treatment Protocol
Cyclopeptide Syndrome Management:
• IV Silibinin (Legalon SIL) — primary antidote where available; inhibits hepatocyte uptake of amatoxins
• Aggressive biliary flushing (nasobiliary drainage if indicated)
• Multi-dose activated charcoal (MDAC) — 50g q4–6h for first 24–48h
• N-acetylcysteine (NAC) IV — hepatoprotective adjunct
• Monitor LFTs, coagulation (PT/INR), creatinine q6–12h
• Liver transplant evaluation if INR >6, creatinine >3 mg/dL, or grade III–IV encephalopathy
• IV Silibinin (Legalon SIL) — primary antidote where available; inhibits hepatocyte uptake of amatoxins
• Aggressive biliary flushing (nasobiliary drainage if indicated)
• Multi-dose activated charcoal (MDAC) — 50g q4–6h for first 24–48h
• N-acetylcysteine (NAC) IV — hepatoprotective adjunct
• Monitor LFTs, coagulation (PT/INR), creatinine q6–12h
• Liver transplant evaluation if INR >6, creatinine >3 mg/dL, or grade III–IV encephalopathy
☢ Suspected Galerina ingestion — Call 911 immediately. Do not wait for symptoms. Initiate charcoal even in asymptomatic patients if <4 hours post-ingestion.
⚠ Tier 2 — Severe, Rarely Fatal
Muscarinic, Neurotropic & GI Toxin Species
Rapid-onset autonomic crises, neurotropic emergencies, and severe gastroenteritis. Prompt clinical management required — particularly for muscarinic species where airway compromise can develop within minutes.
Fiber Cap
Inocybe geophylla (Bull.) P. Kumm.
Tier 2 — Severe
15–30 min onset
Ecological Niche
Mycorrhizal with cloud forest hardwoods and conifers. Found in moist, mossy soils beneath oaks (Quercus) and conifers at mid-elevation cloud forest margins. Common along shaded trail edges and riparian corridors in Oaxaca, Chiapas, and Veracruz.
Identification Features
Cap 2–4 cm, white to lilac-tinged, silky-fibrous (hence “Fiber Cap”); conical when young, expanding to broadly umbonate; gills dirty white to clay; stipe slender, silky; spore print brown. Strong, unpleasant earthy odor.
Toxin Class
Muscarine — potent cholinergic agonist acting on muscarinic acetylcholine receptors. Produces SLUDGE syndrome via parasympathetic overstimulation.
Onset Timeline
15–30 minutes — rapid onset of cholinergic crisis. Duration 6–24 hours depending on dose. Respiratory failure possible in severe cases.
Clinical Presentation (SLUDGE)
Salivation • Lacrimation • Urination • Defecation • GI cramps • Emesis
Also: bradycardia, bronchospasm, bronchorrhea, miosis, diaphoresis. DUMBELS mnemonic equivalent.
Also: bradycardia, bronchospasm, bronchorrhea, miosis, diaphoresis. DUMBELS mnemonic equivalent.
Lookalike Confusion Risk
⚠ Mistaken for small, edible white wild mushrooms or young Agaricus variants. White coloration leads to misidentification as “safe” mushrooms by inexperienced foragers in cloud forest understory.
Treatment Protocol
Muscarinic Toxidrome:
• Atropine Sulfate IV 1–2 mg — titrate to drying of secretions (not to heart rate). Repeat q5–10 min as needed; large doses may be required
• Airway management — secretion-induced bronchospasm may require intubation
• Aggressive IV fluid replacement for losses from salivation, diarrhea, diaphoresis
• No role for pralidoxime (muscarine is not an organophosphate)
• Atropine Sulfate IV 1–2 mg — titrate to drying of secretions (not to heart rate). Repeat q5–10 min as needed; large doses may be required
• Airway management — secretion-induced bronchospasm may require intubation
• Aggressive IV fluid replacement for losses from salivation, diarrhea, diaphoresis
• No role for pralidoxime (muscarine is not an organophosphate)
☢ SLUDGE syndrome — Call 911 • Atropine titration • Airway priority
Ivory Funnel
Clitocybe dealbata (Sowerby) Gillet / C. rivulosa (Pers.) P. Kumm.
Tier 2 — Severe
15–30 min onset
Ecological Niche
Grassy clearings, trail edges, and pasture borders within montane forests. Forms fairy rings in short grass and disturbed soil at the margins of cloud forest communities in Oaxaca and Chiapas highlands. Saprophytic on decaying grass debris.
Identification Features
Cap 2–5 cm, ivory-white to pale grey, funnel-shaped when mature; gills decurrent, crowded, white to pale cream; stipe slender, concolorous; lacks ring; spore print white. Mealy odor. Often in rings.
Toxin Class
Muscarine — same mechanism as Inocybe geophylla. High muscarine content relative to body mass, making dose-per-gram potent in small specimens gathered in quantity.
Onset Timeline
15–30 minutes rapid cholinergic crisis. Severity proportional to quantity ingested.
Lookalike Confusion Risk
⚠ Confused with edible white Marasmius or Laccaria species. White, small, grass-associated mushrooms are frequently gathered by rural households who associate white coloration with safety. This assumption is acutely dangerous in cloud forest pasturelands.
Clinical Presentation
Identical to Inocybe geophylla SLUDGE syndrome: hypersalivation, lacrimation, vomiting, diarrhea, bradycardia, bronchospasm. Miosis may be prominent. Onset within 30 min of ingestion.
Treatment Protocol
Muscarinic Toxidrome (same as Inocybe):
• Atropine Sulfate IV 1–2 mg titrated to secretion drying
• Airway management — bronchospasm and bronchorrhea may be life-threatening
• Aggressive IV fluid replacement
• Symptomatic supportive care; monitor cardiac rhythm
• Atropine Sulfate IV 1–2 mg titrated to secretion drying
• Airway management — bronchospasm and bronchorrhea may be life-threatening
• Aggressive IV fluid replacement
• Symptomatic supportive care; monitor cardiac rhythm
☢ Muscarine poisoning — Call 911 • Atropine IV • Airway management priority
Blue Meanies
Panaeolus cyanescens (Berk. & Broome) Sacc.
Tier 2 — Severe / Pediatric Emergency
20–60 min onset
Ecological Niche
Coprophilous; grows on cattle and horse dung in subtropical and tropical pastures. Abundant in cattle pastures bordering cloud forest communities in Chiapas, Oaxaca lowlands, and Veracruz. Often emerges after rains during warm seasons.
Identification Features
Cap 1.5–4 cm, pale grey-buff to whitish-tan, hemispherical; bruises blue-green where handled; gills mottled grey-black as spores mature; stipe slender, whitish, bruising blue; spore print jet-black.
Toxin Class
Psilocybin / Psilocin — neurotropic hallucinogens acting as serotonin 5-HT2A receptor agonists. Among the most potent naturally-occurring psilocybin sources; 2–3× more potent per gram than many Psilocybe species.
Onset Timeline
20–60 minutes after ingestion. Duration 4–6 hours. Pediatric cases may present with markedly prolonged psychosis and high seizure risk due to weight-adjusted dose.
Lookalike Confusion Risk
⚠ Pediatric Emergency Risk: Gathered intentionally by adults but commonly accessed by children in pasture environments. Frequently contaminated with, or mistaken for, toxic Panaeolus antillarum or localized toxic gasteromycetes, resulting in unexpected severe toxicity. Severe panic reactions, psychosis, and seizures in pediatric patients require emergency intervention.
Clinical Presentation
Visual hallucinations, severe anxiety, panic attacks, tachycardia, hypertension, hyperthermia. Pediatric: acute psychosis, aggression, inconsolable distress, seizures. Serotonin-like syndrome features in overdose.
Treatment Protocol
Neurotropic / Psilocybin Syndrome:
• Quiet, low-stimulation environment — reduce sensory triggers
• Low-dose Benzodiazepines — Diazepam IV/PO for severe agitation or seizures; preferred over antipsychotics
• Monitor cardiac rhythm, temperature, blood pressure
• Pediatric seizures: standard benzodiazepine protocol (Diazepam 0.2–0.3 mg/kg IV)
• No specific antidote; supportive care is definitive management
• Quiet, low-stimulation environment — reduce sensory triggers
• Low-dose Benzodiazepines — Diazepam IV/PO for severe agitation or seizures; preferred over antipsychotics
• Monitor cardiac rhythm, temperature, blood pressure
• Pediatric seizures: standard benzodiazepine protocol (Diazepam 0.2–0.3 mg/kg IV)
• No specific antidote; supportive care is definitive management
☢ Pediatric psilocybin ingestion — Call 911 • Diazepam for seizures • Quiet environment protocol
Jack-o’-Lantern
Omphalotus olivascens H.E. Bigelow, O.K. Mill. & Thiers / O. olearius Complex
Tier 2 — Severe
30 min–2 hr onset
Ecological Niche
Clusters growing on dead hardwood roots, fallen oaks (Quercus), and sweetgums (Liquidambar styraciflua) — a dominant cloud forest tree. Fruiting bodies often emerge from buried root systems, appearing to grow from soil. Common in Oaxacan cloud forests and Sierra de Chiapas.
Identification Features
Cap 5–20 cm, orange to olive-orange, smooth; gills orange, decurrent, bioluminescent (glows faintly green in darkness); stipe solid, tapered; no ring; clustered at wood base. Spore print white to pale cream.
Toxin Class
Illudins (illudin S and M) — sesquiterpene cytotoxins causing direct mucosal damage and prolonged, severe gastroenteritis. Not hepatotoxic in standard doses.
Onset Timeline
30 minutes to 2 hours — severe GI symptoms with violent vomiting and watery diarrhea persisting 6–24 hours. Risk of significant dehydration and electrolyte imbalance.
Lookalike Confusion Risk
⚠ High-frequency confusion with chanterelles: Frequently and dangerously confused with the highly prized, edible wild chanterelle (Cantharellus cibarius complex). The Liquidambar cloud forest is prime chanterelle habitat. Key distinguishing features: Omphalotus has true blade-like gills (not forked ridges), bright orange flesh throughout, grows in dense clusters at wood base, and bioluminesces at night.
Clinical Presentation
Severe, protracted necrotizing gastroenteritis: intense nausea, projectile vomiting, cholera-like diarrhea, severe abdominal cramping. Significant dehydration and electrolyte disturbances (hypokalemia, hyponatremia) in prolonged cases.
Treatment Protocol
Illudin / Severe Gastroenteritis Protocol:
• Aggressive IV Fluid Hydration — isotonic crystalloid; target urine output >0.5 mL/kg/hr
• Ondansetron IV 4–8 mg for refractory vomiting
• Mucosal protectants (sucralfate, PPIs)
• Electrolyte correction — monitor and replace potassium, sodium
• Activated charcoal if <1 hour post-ingestion
• No specific antidote; supportive GI management is definitive
• Aggressive IV Fluid Hydration — isotonic crystalloid; target urine output >0.5 mL/kg/hr
• Ondansetron IV 4–8 mg for refractory vomiting
• Mucosal protectants (sucralfate, PPIs)
• Electrolyte correction — monitor and replace potassium, sodium
• Activated charcoal if <1 hour post-ingestion
• No specific antidote; supportive GI management is definitive
☢ Severe gastroenteritis — 911 if dehydration or unable to tolerate oral fluids • IV fluids • Electrolyte monitoring
Antidote & Treatment Matrix
| Toxin Class | Species | Syndrome | Primary Treatment | Adjunct / Notes |
|---|---|---|---|---|
| Amatoxins | Galerina marginata | Cyclopeptide — hepatic failure | IV Silibinin (Legalon SIL) + aggressive biliary flushing | MDAC q4–6h; N-acetylcysteine IV; transplant evaluation if INR >6 |
| Muscarine | Inocybe geophylla, Clitocybe dealbata | SLUDGE — cholinergic crisis | Atropine Sulfate IV 1–2 mg, titrated to dry secretions | Airway management, aggressive IV fluid replacement; no pralidoxime |
| Illudins | Omphalotus olivascens | Severe necrotizing gastroenteritis | Aggressive IV Fluid Hydration + Ondansetron IV | Mucosal protectants; electrolyte correction (K⁺, Na⁺) |
| Psilocybin / Psilocin | Panaeolus cyanescens | Neurotropic / hallucinogenic | Supportive care in quiet environment | Low-dose Diazepam IV for severe agitation or seizures; pediatric protocol |
🐾 Veterinary Reference — Canine & Livestock Toxicology
Regional Veterinary Context
Cloud forest farms and rural homesteads in Oaxaca, Chiapas, and Veracruz keep dogs as working animals in environments where all five species occur. Livestock grazing in pastures bordering cloud forest have direct access to Panaeolus cyanescens and Clitocybe/Omphalotus fruiting bodies. Rapid triage is essential as muscarinic crises can be fatal within hours in small-breed dogs.
Muscarine Ingestion (Inocybe geophylla / Clitocybe dealbata)
Onset: Rapid (15–30 minutes) — hypersalivation, bradycardia, pinpoint pupils (miosis), watery diarrhea, lacrimation, urination.
Triage: Atropine sulfate 0.02–0.04 mg/kg — administer half dose IV, half dose IM/SQ. Repeat q5–10 min until secretions dry. Monitor airway patency; bronchospasm and bronchorrhea can be rapidly fatal in small dogs.
Supportive: IV fluid support for dehydration losses; monitor cardiac rhythm.
Triage: Atropine sulfate 0.02–0.04 mg/kg — administer half dose IV, half dose IM/SQ. Repeat q5–10 min until secretions dry. Monitor airway patency; bronchospasm and bronchorrhea can be rapidly fatal in small dogs.
Supportive: IV fluid support for dehydration losses; monitor cardiac rhythm.
Amatoxin Ingestion (Galerina marginata)
Onset: Delayed (6–24 hours) — initial severe gastroenteritis followed by apparent recovery, then acute hepatic failure with elevated liver enzymes (ALT, AST), sudden coagulopathy, icterus.
Triage: Prioritize gastric lavage if <2 hours post-ingestion; immediate activated charcoal binding (1–3 g/kg PO). Aggressive IV fluid therapy; serial liver enzyme monitoring q12–24h.
Supportive: Liver support with SAMe (S-adenosylmethionine) 20 mg/kg PO daily; Milk Thistle (silymarin) where IV silibinin unavailable; N-acetylcysteine IV in severe cases.
Triage: Prioritize gastric lavage if <2 hours post-ingestion; immediate activated charcoal binding (1–3 g/kg PO). Aggressive IV fluid therapy; serial liver enzyme monitoring q12–24h.
Supportive: Liver support with SAMe (S-adenosylmethionine) 20 mg/kg PO daily; Milk Thistle (silymarin) where IV silibinin unavailable; N-acetylcysteine IV in severe cases.
Psilocybin Ingestion (Panaeolus cyanescens)
Onset: 20–60 minutes — disorientation, vocalization, ataxia, mydriasis (dilated pupils), tremors, anxiety, potential seizures.
Triage: Diazepam 0.5–1 mg/kg IV for seizure control. Quiet, low-stimulation environment. Monitor thermoregulation.
Supportive: Activated charcoal if <1 hour post-ingestion; IV fluid support.
Triage: Diazepam 0.5–1 mg/kg IV for seizure control. Quiet, low-stimulation environment. Monitor thermoregulation.
Supportive: Activated charcoal if <1 hour post-ingestion; IV fluid support.
GI Toxin Ingestion (Omphalotus complex)
Onset: 30 min–2 hours — severe vomiting, profuse diarrhea, abdominal pain, salivation (hypersalivation from gastric irritation).
Triage: IV crystalloid fluid replacement; antiemetics (maropitant 1 mg/kg SQ); electrolyte monitoring (potassium).
Supportive: GI protectants; rehydration; monitoring for dehydration-related complications.
Triage: IV crystalloid fluid replacement; antiemetics (maropitant 1 mg/kg SQ); electrolyte monitoring (potassium).
Supportive: GI protectants; rehydration; monitoring for dehydration-related complications.
Regional Clinical Note — Cloud Forest Dual-Risk Profile
The Southern Cloud Forest presents a unique dual poisoning risk not found in other Mexican regions. Galerina marginata shares ecological niche and morphological features with the Psilocybe species gathered for traditional Zapotec and Mazatec ceremonial use in Oaxaca and Chiapas. Clinicians should be aware that patients presenting with unexpectedly severe GI symptoms following intentional mushroom ingestion may have gathered Galerina rather than Psilocybe — this clinical scenario requires immediate amatoxin protocol regardless of stated intent. The bioluminescent Omphalotus / chanterelle confusion is the most common poisoning presentation in this region during rainy season (July–October).