Big laughing gym vs deadly galerina: the small brown one is deadly

Quick answer

The big laughing gym is large and orange-yellow, with caps 2 to 7 inches across on stems up to 1.5 inches thick; the deadly galerina is small and honey-brown, with caps 0.5 to 1.5 inches across on thin stems usually under a quarter inch thick. Both drop a rusty brown spore print and grow on wood with a ring on the stem.

Deadly lookalike

The deadly galerina can be fatal.

Unlike the big laughing gym, the deadly galerina (Galerina marginata) contains amatoxins, the same toxins as the death cap, at similar concentrations, according to the University of British Columbia's Mushrooms Up! guide. Amatoxins stop cells from making proteins by blocking the enzyme RNA polymerase II. The Bay Area Mycological Society records that symptoms usually begin 6 to 24 hours after eating, followed by an apparent recovery and then liver damage from about 72 hours. Cooking does not destroy amatoxins. The big laughing gym is listed as inedible and bitter; First Nature notes that specimens from several regions have been found to contain the hallucinogen psilocybin.

If someone has eaten a wild mushroom and feels unwell, or may have eaten one of these, call poison control now: 1-800-222-1222 in the US. Do not wait for symptoms.

Side by side

The tell for each

Three young big laughing gym mushrooms with rounded, golden-orange, finely scaly caps on dark wood
Toxic lookalike
Big Laughing GymGymnopilus junonius

The tellA large, orange-yellow cluster on wood with a ring on a thick stem and a rusty orange spore print.

A single deadly galerina with an orange-brown cap and gills, leaning over gray slate fragments
Deadly
Deadly GalerinaGalerina marginata

The tellSmall honey-brown caps in clusters on rotting wood, with rusty brown gills, a thin ring on the stem, and a rusty brown spore print.

How they differ

Differences between the big laughing gym and the deadly galerina
FeatureBig Laughing GymDeadly Galerina
Cap sizeBig Laughing Gym2 to 7 inches (5 to 18 cm).Deadly Galerina0.5 to 1.5 inches (1 to 4 cm).
StemBig Laughing GymThick, up to 1.5 inches (4 cm), often swollen.Deadly GalerinaThin, usually under 1/4 inch (0.6 cm).
Cap color and surfaceBig Laughing GymOrange-yellow to rusty orange, dry, with fine silky fibers or small scales.Deadly GalerinaHoney-brown drying to tan, smooth and slightly sticky.
RingBig Laughing GymA membranous ring near the top that turns rusty, sometimes wearing away.Deadly GalerinaA thin ring or ring zone that catches rusty spores, sometimes disappearing.
FleshBig Laughing GymPale yellow and firm; taste recorded as intensely bitter.Deadly GalerinaThin and brownish; smell mild to mealy.
Spore printBig Laughing GymRusty orange to bright rusty brown.Deadly GalerinaRusty brown.

FAQ

Common questions

Is the big laughing gym poisonous?

Field guides list it as poisonous or inedible, and its flesh is intensely bitter. Psilocybin has been reported in some collections but not in others.

Does the big laughing gym look like the deadly galerina?

Both are rusty-spored mushrooms with rings that grow in clusters on wood. The galerina is far smaller and contains amatoxins, the toxins of the death cap.

Sources

Where these facts come from

  1. Gymnopilus junonius

    MushroomExpert.com

  2. Galerina marginata

    MushroomExpert.com

  3. Galerina marginata, deadly galerina (Mushrooms Up!)

    Beaty Biodiversity Museum, University of British Columbia

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