False Morel

Conditionally edible

Scientific name	Gyromitra esculenta
Family	Discinaceae
Portuguese name	Falsa-morchela, Bonete
English name	False morel, Brain mushroom, Turban fungus
Season	March, April, May
Habitat	Pine forest, Mixed forest
Look-alikes	Common Morel

Description

Gyromitra esculenta (false morel, brain mushroom, turban fungus) is a conditionally edible mushroom, historically eaten in Scandinavia and Eastern Europe, but banned from sale in many countries due to its gyromitrin content. The name esculenta (“edible”) is a paradox left over from the era before its toxicity was discovered.

The cap resembles a human brain — wrinkled, lobed, and irregular. This appearance is the key to distinguishing the false morel from true morels.

Cap

• Diameter: 4–12 cm
• Shape: brain-like — irregularly lobed, bumpy, wrinkled
• Colour: light brown to dark chestnut
• Surface: deeply folded with convoluted furrows (NOT honeycomb-like, as in morels)
• Key difference from morels: folds are random, not forming a regular honeycomb pattern

Stem

• Height: 3–7 cm
• Width: 2–5 cm
• Colour: whitish to cream
• Structure: hollow or with irregular chambers, brittle

Flesh

• Colour: whitish, thin, brittle
• Smell: pleasant, mushroomy
• Taste: pleasant (DO NOT taste raw!)

Spore print

Cream.

Where and when

Season in Portugal

• Main season: March–May (an early spring species)
• One of the first mushrooms of the season — appears when forest mushrooms are not yet growing

Habitats in Portugal

• Pine forests — under pines, on sandy soils
• Mixed forests — on forest edges, clearings
• Logged areas and burned ground — often on disturbed sites
• Saprotroph — grows on dead wood or organic-rich soil

Look-alikes

Comparison with the morel

Safety rule

If the cap folds are chaotic (like a brain), not honeycomb (like a sponge) — it is a false morel. Do not collect if you are not 100% certain.

Toxicology

Gyromitrin

• Compound: gyromitrin (N-methyl-N-formylhydrazone of acetaldehyde)
• Metabolism: hydrolysed in the body to monomethylhydrazine (MMH) — a highly toxic compound
• MMH — a rocket fuel component, hepatotoxin, possible carcinogen

Poisoning symptoms (6–12 hours after ingestion)

1. Phase 1 (6–12 h): nausea, vomiting, watery diarrhoea, abdominal pain
2. Phase 2 (24–48 h): jaundice, right upper quadrant pain — liver damage
3. Phase 3 (severe cases): kidney failure, methaemoglobinaemia, coma
4. Mortality: 10–30% without intensive care

First aid

1. Call 112 immediately
2. Call CIAV: 808 250 143
3. Do not induce vomiting
4. Save remaining mushrooms and vomit for analysis
5. Prepare for hospitalisation — intensive care may be required

See Also

Safety:

• Deadly Species
• Common Look-alikes
• First Aid for Mushroom Poisoning

Species:

• Morel

Sources

1. Persoon C.H. — Synopsis methodica fungorum (1801) — original description
2. Michelot D., Toth B. — Poisoning by Gyromitra esculenta — a review. Journal of Applied Toxicology (1991)
3. Flammer R., Schenk-Jäger K. — Gyromitrin poisoning. Swiss Medical Weekly (2018)
4. BioDiversity4All / GBIF Portugal — occurrence records of Gyromitra esculenta
5. First-Nature — Gyromitra esculenta, False Morel

Disclaimer: Identifying mushrooms from descriptions and photographs on the internet is not a substitute for consulting an experienced mycologist. The authors assume no responsibility for the consequences of collecting and consuming mushrooms. If you suspect mushroom poisoning, call 112 immediately.