About This Guide
This guide covers the most clinically significant toxic mushroom species documented in Southeast Asia β including the lethal amatoxin-producing Amanita exitialis, Amanita subjunquillea, and Amanita fuliginea; the myotoxic Russula subnigricans; the hypoglycemic cardiac toxin Trogia venenata; the dermatotoxic watch species Podostroma cornu-damae; the triple-organ nephrotoxic Amanita pseudoporphyria; and the gastrointestinal toxin producer Chlorophyllum molybdites. Species are documented across all nine nations: Thailand, Vietnam, the Philippines, Indonesia, Malaysia, Myanmar, Cambodia, Laos, and Singapore.
Data-only reference β no photographs. Species identification for clinical management must be confirmed by a toxicologist, mycologist, or poison control specialist, not from this text alone.
Quick Reference β All Species
| Species | Tier | Toxin Class | Onset | Primary Risk |
|---|---|---|---|---|
| Amanita exitialis / subjunquillea / fuliginea | Tier 1 | Amatoxins (heat-stable bicyclic octapeptides) | Biphasic: 6β24h GI / 72β96h hepatic | Fulminant hepatic necrosis, death |
| Russula subnigricans | Tier 1 | Cycloprop-2-ene-carboxylic acid | 30 minβ3h GI / 4β72h myotoxic | Rhabdomyolysis, AKI, cardiac arrhythmia |
| Trogia venenata | Tier 1 | Hypoglycin-A-like amino acids | 1β5 hours | Fatal ventricular arrhythmia, hypoglycemia |
| Podostroma cornu-damae | Tier 1 | Macrocyclic trichothecene mycotoxins | 1β4h early GI; Days 2β7 systemic collapse | Pancytopenia, multi-organ failure, death |
| Amanita pseudoporphyria | Tier 2 | Allenic norleucine | 1β12h GI; 24β48h renal/hepatic/cardiac | Nephrotoxic, hepatotoxic, myocardial injury |
| Chlorophyllum molybdites | Tier 3 | Leucoagaricitin (heat-labile toxic protein) | Under 2 hours | Severe GI toxidrome; rarely fatal in healthy adults |
Two-Branch Triage Algorithm
Early onset under 6 hours branches to: isolated GI distress (Tier 3), myotoxic rhabdomyolysis (Tier 1), and hypoglycemic cardiac (Tier 1).
Late onset over 6 hours branches to: amatoxin hepatic syndrome (Tier 1), nephrotoxic mixed syndrome (Tier 2), and trichothecene systemic syndrome (Tier 1).
Bedside Triage Decision Matrix
| Onset | Toxidrome | Species | Immediate Actions |
|---|---|---|---|
| Early 1β4 h GI; delayed systemic collapse Days 2β7 | Trichothecene cellular translation inhibition | Podostroma cornu-damae | Immediate dermal decontamination, reverse isolation, G-CSF 5 mcg/kg/day SC, broad-spectrum antibiotics, blood products, TPE or CHDF. Clinicians must not be falsely reassured by apparent recovery after the early GI phase. Delayed systemic collapse with pancytopenia, alopecia, and multi-organ failure follows Days 2β7. |
| Early 30 minβ3 hours | Myotoxic rhabdomyolysis | Russula subnigricans | High-volume IV fluids targeting urine output above 200 mL/h, urinary alkalinization, continuous CK and cardiac monitoring, CRRT if CK above 50,000 U/L. Fluid target for rhabdomyolysis is substantially higher than hepatotoxic protocol β must never be confused. |
| Ultra-rapid 1β5 hours | Hypoglycemic cardiomyopathic toxidrome | Trogia venenata | Immediate IV dextrose D50W bolus, central line continuous glucose infusion, mandatory ECG telemetry entire admission, strictly avoid intravenous lipid emulsions. |
| Delayed 6β24 hours | Hepatotoxic amatoxin syndrome | Amanita exitialis, Amanita subjunquillea, Amanita fuliginea | Immediate ICU admission, IV Silibinin, extended IV NAC, multidose activated charcoal, notify liver transplant unit immediately. |
| Delayed 8β24 hours | Nephrotoxic hepatotoxic cardiac mixed toxidrome | Amanita pseudoporphyria | Conservative fluid diuresis, continuous renal, hepatic, and cardiac panel monitoring every 6 hours, early nephrology and cardiology consultation. |
| Early under 2 hours | Acute gastrointestinal distress | Chlorophyllum molybdites | IV crystalloid resuscitation, IV Ondansetron. Do NOT administer Loperamide or Diphenoxylate/Atropine. |
Amanita subjunquillea: highland montane zones 800β2,200 m in Thailand, Vietnam, Laos, Myanmar. Absent from lowland equatorial zones including Singapore, lowland Philippines, and coastal Indonesia.
Amanita fuliginea: widest range in Southeast Asia β Thailand, Vietnam, Peninsular Malaysia, Sumatra, Java, and Luzon (Philippines). Associated with Fagaceae and Dipterocarpaceae in mixed forests.
A. subjunquillea: pale yellowish-brown to olive cap, free white gills, persistent skirt-like annulus, saccate volva, white spore print.
A. fuliginea: dark grey to sooty brown cap, free white gills, persistent annulus, saccate volva, white spore print.
All three: heat-stable amatoxins survive cooking at any temperature.
Lookalike Confusion β Southeast Asia Specific
Toxin Mechanism
Heat-stable bicyclic octapeptide amatoxins are absorbed via OATP1B3 hepatic transporters into hepatocytes where they irreversibly inhibit RNA polymerase II, causing complete cessation of protein synthesis and progressive hepatocyte necrosis. The false recovery phase between 24 and 72 hours occurs as the initial GI phase resolves β hepatic destruction continues silently during this window and must not be misinterpreted as clinical improvement. Fulminant hepatic failure with jaundice, coagulopathy, encephalopathy, and multi-organ failure follows at 72β96 hours and beyond.
Symptom Timeline
- Phase 1 (6β24h): Severe cholera-like GI distress β vomiting, profuse watery diarrhea, abdominal cramping.
- Phase 2 (24β72h): False recovery phase β GI symptoms resolve, patient appears improved. Hepatic necrosis continues silently. Monitor AST, ALT, INR, creatinine, bilirubin, blood glucose every 6 hours throughout this phase.
- Phase 3 (72β96h and beyond): Fulminant hepatic failure β jaundice, coagulopathy with rising INR, hepatic encephalopathy, hypoglycemia, multi-organ failure.
ICU Treatment Protocol β Adults
Initial Resuscitation & Decontamination
- Aggressive IV fluid resuscitation
- Multidose activated charcoal 50 g every 4β6 hours via NG tube for first 24β48 hours to interrupt enterohepatic amatoxin recirculation
- Notify liver transplant unit immediately on admission β do not wait for deterioration
- Liver and kidney panels every 6 hours
- MARS or TPE if progressive coagulopathy or encephalopathy develops
IV Silibinin (Legalon SIL)
- Loading dose: 5 mg/kg over 1 hour
- Maintenance: 20 mg/kg/day as four discrete 6-hour infusion blocks. Continue up to 6 days.
- Rural alternative if Silibinin unavailable: High-Dose Penicillin G 1,000,000 units/kg/day IV divided into 6 doses as an alternative OATP1B3 blocker.
IV NAC β Three-Bag Regimen (Adults)
- Bag 1: 150 mg/kg over 1 hour
- Bag 2: 50 mg/kg over 4 hours
- Bag 3: 100 mg/kg over 16 hours
- Continue until liver function stabilizes
Pediatric Dosing
Pediatric Protocol
- Activated charcoal 1 g/kg every 4 hours via NG tube
- IV NAC same three-bag weight-based protocol as adults with careful fluid volume calculation to prevent cerebral edema
- Silibinin 20 mg/kg/day same as adults weight-based
- Strict fluid balance 1.5β2.0 mL/kg/h to prevent cerebral edema as liver function deteriorates
- Blood glucose monitoring every 2 hours
- Low threshold for emergency liver transplant assessment
King's College Criteria β Non-Paracetamol Protocol for Amatoxin Poisoning
King's College Criteria β Amatoxin Thresholds
Single criterion (sufficient alone): pH below 7.3 regardless of encephalopathy grade.
OR the combination of simultaneously: INR above 6.5 AND creatinine above 300 micromol/L AND encephalopathy grade III or IV.
Clinical modification for amatoxin: Many toxicology centers now activate the transplant list at INR above 3.5 with creatinine above 200 in the first 72 hours without waiting for INR 6.5 β because waiting for the full criteria threshold often results in death before organ availability.
Meixner Test β Bedside Protocol
Meixner Test for Amatoxin Detection
- Place a drop of mushroom juice or crushed tissue on uncoated newsprint paper.
- Allow to dry completely.
- Apply one drop of concentrated hydrochloric acid.
- Apply gentle heat β without heat activation, false negatives are common.
- Positive result: blue-green color change within 5 minutes indicates amatoxin presence.
False positive warning: Certain tryptamine derivatives in Psilocybe and Inocybe species can produce the same blue-green color. Never use a negative Meixner test result to discharge a patient if clinical history is consistent with amatoxin poisoning. A negative result does not rule out amatoxin poisoning β treat clinically if history is consistent.
Urine Amatoxin Testing
π Veterinary β Dogs
- Clinical signs: Delayed onset 6β12 hours, bloody diarrhea, progressive weakness, jaundice, falling BUN and hypoglycemia during false recovery phase, terminal hepatic coma.
- Treatment: Immediate GI decontamination if within 2 hours of ingestion, aggressive IV fluid diuresis, multidose activated charcoal 1β2 g/kg, IV NAC loading 140 mg/kg then 70 mg/kg every 4 hours for 17 doses, SAMe 20 mg/kg, Silibinin 30β50 mg/kg divided every 8 hours.
- Prognosis: High mortality without early intervention.
π Veterinary β Cats
- Clinical signs: Sudden severe dehydration, vomiting, extreme lethargy, yellowed mucous membranes, onset 6β12 hours.
- Emesis induction: Dexmedetomidine 7 mcg/kg IM followed by Atipamezole reversal.
- Treatment: Intensive IV fluid therapy, SAMe and NAC liver protectants, thermal support.
- Prognosis: Guarded.
Toxin Mechanism
Cycloprop-2-ene-carboxylic acid triggers a biochemical cascade that breaks down the cell membrane of striated muscle fiber tissue by interfering with metabolic enzymes. This is NOT mechanical disruption of the sarcoplasmic reticulum. The result is massive release of myoglobin and intracellular potassium into the bloodstream. Myoglobin causes acute tubular necrosis and kidney injury through cast formation in renal tubules. Hyperkalemia is an immediate cardiac life threat causing fatal ventricular arrhythmias and requires continuous ECG monitoring throughout admission.
Symptom Timeline
- 30 minβ3 hours: Severe GI distress, vomiting, diarrhea.
- 4β12 hours: Severe myalgia, progressive muscle rigidity and weakness.
- Tea-colored urine: Myoglobinuria β a critical clinical warning sign.
- 12β72 hours: Acute kidney injury, hyperkalemia, cardiac arrhythmias, potential cardiac failure.
ICU Treatment Protocol β Adults
Rhabdomyolysis Protocol
- Rapid IV fluid resuscitation 200β300 mL/h targeting urine output above 200 mL/h
- Sodium bicarbonate urinary alkalinization targeting urine pH above 6.5
- CK monitoring every 4 hours
- CRRT initiated if CK rises above 50,000 U/L or renal function deteriorates β use high-flux membrane specification
- 24β36 hour window: Extracorporeal clearance becomes significantly less effective beyond this window β initiate early.
- Continuous cardiac monitoring with specific attention to hyperkalemia β treat immediately if potassium rises above 6.0 mmol/L
Do NOT apply the hepatotoxic fluid protocol to rhabdomyolysis patients.
Pediatric Dosing
Pediatric Rhabdomyolysis Protocol
- Forced diuresis target: 3.0β4.0 mL/kg/h specifically for rhabdomyolysis to prevent myoglobin crystallization in pediatric proximal tubules
- This target is substantially higher than the hepatotoxic fluid protocol β must never be confused with it.
- Sodium bicarbonate 1β2 mEq/kg/h for urinary alkalinization
- Continuous CK and cardiac monitoring
π Veterinary β Dogs
- Clinical signs: Rapid vomiting, muscle tremors, progressive weakness, dark tea-colored urine, onset 1β3 hours.
- Treatment: Aggressive IV fluid diuresis, urinary alkalinization, continuous CK monitoring, supportive cardiac care.
- NSAID prohibition: NSAIDs are contraindicated due to nephrotoxic synergy with myoglobinuria-induced renal injury.
- Safe analgesics: Fentanyl CRI β avoid all NSAIDs.
π Veterinary β Cats
- Clinical signs: Vomiting, muscle rigidity, pigmented urine, weakness.
- Treatment: IV fluids, urinary alkalinization, supportive cardiac care.
- Safe analgesics: Buprenorphine or methadone β avoid NSAIDs.
Toxin Mechanism
Contains native toxic amino acids including 2R-amino-4S-hydroxy-5-hexynoic acid and L-pipecolic acid. These compounds act identically to hypoglycin A found in ackee fruit. They irreversibly inhibit acyl-CoA dehydrogenases, completely blocking mitochondrial fatty acid beta-oxidation. Because the human myocardium relies on fatty acid beta-oxidation for approximately 70% of its ATP production, this toxin induces sudden metabolic starvation of the heart muscle, precipitating fatal ventricular arrhythmias.
Symptom Timeline
- Rapid onset 1β5 hours
- Extreme weakness and dizziness, cold sweats
- Severe hypoglycemia below 2 mmol/L
- Neurological collapse, generalized seizures
- Sudden cardiac arrest
ICU Treatment Protocol β Adults
Hypoglycemic Cardiac Protocol
- Immediate IV dextrose D50W bolus
- Continuous central line glucose infusion D10 or D20 to maintain normoglycemia
- Mandatory continuous ECG telemetry throughout the entire admission β even after glucose normalizes, because the cardiac mechanism is independent of blood glucose
- Strictly avoid intravenous lipid emulsions β these worsen the beta-oxidation blockade and may precipitate fatal arrhythmias
Pediatric Dosing
Pediatric Protocol
- IV dextrose 0.5β1.0 g/kg D25W bolus
- Continuous glucose infusion 6β8 mg/kg/min via central access
- Blood glucose maintenance target above 4 mmol/L
- Mandatory continuous cardiac monitoring throughout admission
π Veterinary β Dogs
- Clinical signs: Severe seizures, sudden weakness, hypoglycemia, cardiac collapse, onset 1β3 hours.
- Treatment: Immediate IV dextrose bolus, continuous glucose infusion, cardiac monitoring.
- Prohibition: Propofol and all lipid-based sedatives are strictly contraindicated β they worsen the acyl-CoA dehydrogenase blockade and may precipitate fatal cardiac arrest.
π Veterinary β Cats
- Clinical signs: Similar to dogs β weakness, hypoglycemia, cardiac collapse.
- Treatment: Immediate dextrose supplementation, continuous glucose monitoring, cardiac support.
- Prohibition: Propofol and all lipid-based anesthetic agents are strictly contraindicated.
Toxin Mechanism
Contains specific macrocyclic trichothecene mycotoxins including satratoxin H, roridin E, and verrucarin J. These compounds inhibit the 60S ribosomal subunit, halting protein synthesis throughout all rapidly dividing cells, causing progressive multi-organ failure and systemic pancytopenia. This is a lethal systemic trichothecene toxidrome that mimics systemic radiation poisoning. It must NEVER be classified as a GI irritant.
Symptom Timeline β Two Distinct Phases
- Phase 1 (1β4 hours): Early GI symptoms β nausea, vomiting, diarrhea. Apparent early recovery.
- CLINICIANS MUST NOT BE FALSELY REASSURED by apparent recovery after the early GI phase.
- Phase 2 (Days 2β7): Delayed multi-system collapse β severe skin and mucosal membrane peeling, total body alopecia, pancytopenia, bone marrow suppression, gastrointestinal hemorrhage, multi-organ failure.
ICU Treatment Protocol
Trichothecene Protocol
- Immediate full dermal decontamination: 15β20 minutes running water. Do not scrub β scrubbing drives toxin deeper into skin.
- Protective reverse isolation immediately
- G-CSF 5 mcg/kg/day subcutaneous to stimulate neutrophil recovery
- Empiric broad-spectrum antibiotics for immunocompromised coverage
- Blood products as needed for pancytopenia β monitor CBC daily
- Early therapeutic plasma exchange (TPE) or continuous hemodiafiltration (CHDF)
Pediatric Dosing
Pediatric Protocol
- G-CSF 5 mcg/kg/day weight-based same as adults
- Strict infection control given severity of bone marrow suppression
- Blood product transfusion thresholds should be lower than adult thresholds given pediatric cardiovascular reserve
π Veterinary β Dogs
- Clinical signs: Severe progressive GI distress, systemic toxicity, bone marrow suppression. High mortality.
- Clinician must wear nitrile gloves when handling the animal.
- Treatment: Immediate dermal decontamination if contacted, aggressive supportive care, G-CSF if available.
- Prognosis: Guarded β high mortality.
π Veterinary β Cats
- Clinical signs: Similar to dogs, severe progressive systemic toxicity.
- Clinician must wear nitrile gloves when handling the animal.
- Treatment: Immediate decontamination, intensive supportive care.
- Prognosis: Near 100% fatal without immediate decontamination.
Toxin Mechanism
Allenic norleucine (2-amino-4,5-hexadienoic acid) concentrates within the renal parenchyma causing severe oxidative stress and acute tubular necrosis. East Asian CDC cohort data confirms this is a triple threat toxin: simultaneous renal acute tubular necrosis, direct hepatotoxicity with coagulopathy and INR elevation, and direct myocardial injury with troponin elevation and reversible left ventricular dysfunction. Clinicians must establish continuous evaluation of renal, hepatic, AND cardiac panels simultaneously β never assume non-renal organ systems are spared.
Symptom Timeline
- 1β12 hours: Mild GI distress.
- 24β48 hours: Severe bilateral flank pain, acute renal failure with oliguria or anuria.
- Concurrent: Liver enzyme elevation, rising INR, troponin elevation, ECG changes.
ICU Treatment Protocol β Adults
Triple-Organ Monitoring Protocol
- Conservative IV fluid resuscitation β do not use aggressive fluid loading
- Continuous monitoring of renal panels (creatinine, BUN, urinalysis for casts and proteinuria), liver panels (ALT, AST, INR), and cardiac panels (troponin, ECG) every 6 hours
- Urgent nephrology consultation for early intermittent hemodialysis or CVVH
- Cardiology consultation for myocardial injury monitoring
Pediatric Dosing
Pediatric Protocol
- Conservative weight-based IV fluid resuscitation 1.0β1.5 mL/kg/h
- Strict fluid balance monitoring every 2 hours
- Do NOT exceed this target β volume overload in a pediatric patient with nephrotoxic acute kidney injury will rapidly precipitate pulmonary edema and cerebral swelling.
- Exceptionally low threshold for early CVVH given the child's limited renal reserve
π Veterinary β Dogs
- Diagnostics: Urinalysis for casts and proteinuria, serum creatinine and BUN, liver transaminases, cardiac troponin, continuous ECG telemetry.
- Treatment: Cautious IV fluid diuresis strictly titrated to actual hourly urine output β avoid aggressive fluid loading or traditional flushing targets.
π Veterinary β Cats
- Diagnostics: Urinalysis, renal and hepatic biochemistry panels, cardiac troponin, ECG.
- Treatment: Conservative IV fluid therapy via syringe pump titrated to match insensible losses if urine output drops.
- Prognosis: Guarded to poor if acute kidney injury or myocardial changes manifest.
Local Names
Thailand: ΰΉΰΈ«ΰΉΰΈΰΈΰΈ£ΰΈ°ΰΉΰΈΰΈΰΈΰΈ£ΰΈ΅ΰΈΰΉΰΈΰΈ΅ΰΈ’ΰΈ§ | Vietnam: NαΊ₯m Γ΄ xanh / NαΊ₯m tΓ n dΓΉ Δα»c | Philippines: Payong-payongan / Kabuteng lason | Indonesia: Jamur payung beracun / Jamur hijau
Edible Lookalike Confusion
Termitomyces spp. across Thailand, Vietnam, Philippines, and Indonesia β prized edible species. CRITICAL DISTINCTION: Termitomyces grows from a termite nest with a central spike (perforatorium), has white gills and white spore print throughout maturity.
Macrolepiota procera (Parasol Mushroom) β edible, similar large white cap and prominent ring. CRITICAL DISTINCTION: Macrolepiota procera has white gills and white spore print versus the distinctly green spore print of Chlorophyllum molybdites.
Toxin Mechanism
The active toxic compound is Leucoagaricitin β a high-molecular-weight heat-labile toxic protein that causes severe GI mucosal irritation.
Symptom Timeline
Onset under 2 hours: violent projectile vomiting, profuse watery to bloody diarrhea, severe abdominal cramping, rapid dehydration. Self-limiting in most healthy adults but serious in children, elderly, and immunocompromised.
Treatment
GI Resuscitation Protocol
- IV crystalloid fluid resuscitation 20 mL/kg boluses isotonic crystalloid
- IV Ondansetron 0.15 mg/kg per dose, maximum 4 mg per dose
- Continuous electrolyte monitoring β specific attention to hypokalemia and metabolic alkalosis from prolonged vomiting
- Hospital admission recommended for all pediatric patients and all vulnerable adults
π Veterinary β Dogs
- Shock dose IV fluids 60β90 mL/kg to effect
- Maropitant (Cerenia) 1 mg/kg SC q24h
- Correct hypokalemia
π Veterinary β Cats
- Shock dose IV fluids 40β60 mL/kg to effect
- Antiemetics, electrolyte support
Thailand
Vietnam
Philippines
Indonesia
Malaysia
Myanmar
Cambodia
Laos
Singapore
Demographics
Patient age, weight, and number of people exposed from the same foraging or meal event.
Location
Specific country, province, habitat type, forest type, elevation, and substrate where the mushroom was collected. Flag rubber plantations and livestock manure-fertilized agricultural fields as Chlorophyllum molybdites habitat. Flag wild dipterocarp and oak forests in submontane northern zones as Amanita habitat.
Timeline β Critical Diagnostic Rule
Precise ingestion time and precise first symptom onset time.
Onset under 6 hours suggests benign Chlorophyllum molybdites or a mixed ingestion.
Onset delayed beyond 6β12 hours is highly suggestive of lethal cyclopeptide-containing Amanita poisoning and must be treated as such immediately.
Preparation Method
Raw or cooked. Document whether local visual detoxifying myths were attempted β boiling with a silver coin, adding rice grains, boiling with wild herbs. These methods are totally invalid and have no scientific basis. They dangerously delay hospital presentation and must be documented so the clinical team understands the patient may have delayed seeking care.
Sample Preservation
Preserve any remaining raw mushroom material refrigerated in a paper bag β never plastic, which accelerates decomposition. If refrigeration is unavailable in rural settings: air dry the specimen or pack in dry silica gel packs.
Gastric aspirate: Useful for microscopic spore analysis. Amanita spores are white, subglobose, and amyloid. Chlorophyllum spores are green, smooth, and truncated with an apical pore.
Laboratory Limitations β Southeast Asia District Hospitals
Amatoxin ELISA kits are rarely stocked outside tier-1 capital city university hospitals in Southeast Asia β triaging must rely on symptom onset latency and basic serial hepatic and renal function panels at the vast majority of district hospitals. The vast majority of district hospitals in Cambodia, Myanmar, Laos, and rural Indonesia cannot perform urine amatoxin assays or emergency ELISA panels.
Treatment with IV fluids and OATP1B3 inhibitors must start immediately based on clinical history alone β do not wait for laboratory confirmation.
Urine amatoxin testing: Optimal within 48 hours of ingestion. Sensitivity drops dramatically after 72 hours due to hepatic trapping. Do not rely on urine testing beyond 72β96 hours for clinical decision-making.
Language Barrier
Visual matching cards with high-resolution photographs of Amanita exitialis, Amanita pseudoporphyria, and Chlorophyllum molybdites are recommended for clinical facilities serving Mekong subregion border areas with migrant worker populations who may speak Thai, Burmese, Lao, Khmer, or minority languages rather than the national language.
Pre-Transport Stabilization β Rural Southeast Asia
If delayed-onset poisoning presents to a remote clinic, the patient must not be transferred without an active large-bore IV line running aggressive crystalloid hydration. Death in rural Southeast Asia frequently occurs from hypovolemic shock during long mountain transports β not from hepatic necrosis.
Road transport delays in mountainous terrain in northern Thailand, Shan State Myanmar, and the Central Highlands of Vietnam can take 12β36 hours to reach a tertiary hospital.