⚠ If you suspect ingestion of this species, call Poison Control immediately:
1-800-222-1222 (US) · poison.org

Marbled Amanita / Ironwood Amanita

Amanita marmorata

⚠ Severely Toxic

Seek emergency medical care immediately

Peak season: Late summer and fall; peaks during wet periods

Key Identification Features

White to pale cream cap with marbled gray/tan streaks
persistent stem ring
conspicuous sac-like volva cup at stem base. Found under Ironwood (Casuarina), Eucalyptus, and Paperbark. All 8 principal Hawaiian Islands. Fruiting: Late summer and fall. Local name: Ironwood Amanita. Lookalikes: Edible Agaricus field mushrooms — Agaricus lack a basal volva cup and have chocolate-brown gills at maturity.

Symptoms & Toxicity

Severe gastrointestinal distress, intense nausea, vomiting, abdominal colic, watery diarrhea. Onset: 2-4 hours (can be delayed 6+ hours).

Regions Found

Hawaii

Look-Alikes

No documented look-alikes on record.

Safety disclaimer: This page is for educational purposes only. Never eat a wild mushroom based solely on online information. Always verify identification using multiple reliable field guides and, when possible, consult an experienced forager or mycologist. When in doubt, don't eat it. Spore & Scout accepts no responsibility for identification errors or adverse reactions. If you believe someone has ingested a toxic mushroom, call Poison Control (1-800-222-1222) immediately.