🚨 CRITICAL SAFETY PROTOCOL 🚨
If a toxic mushroom ingestion is suspected, do not wait for symptoms to appear. Seek emergency medical care immediately.

In the US: Call Poison Control at 1-800-222-1222
In Canada: Call your provincial hotline (ON: 1-800-268-9017, QC: 1-800-463-5060, BC: 1-800-567-8911)
International: Contact your country's national emergency number (911 / 999 / 112 / 000) or local hospital emergency department right away

Late Fall Oyster (Olive Mock Oyster)

Sarcomyxa serotina

⚠ Mildly Toxic

Monitor symptoms; call Poison Control if they persist: 1-800-222-1222

Habitat: Decaying hardwood and conifer trunks, fallen logs, and dead branches.
Peak season: Autumn to Early Winter (September to December)

Key Identification Features

Cap is olive-green, yellowish-green, or dark muddy-green (never the ivory-white to grey-brown of true Oyster mushrooms)
stem covered in fine dark brownish scales or yellowish fuzz
flesh exceptionally tough and rubbery.

Symptoms & Toxicity

Onset within 2 hours: lingering bitter taste, mild stomach cramping, nausea, minor digestive tract irritation from tough, unpalatable fibers.

Regions Found

Northeast

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, seek emergency medical care immediately. US: 1-800-222-1222 | Canada: contact your provincial hotline | International: dial your national emergency number (911 / 999 / 112 / 000).