Meadow mushroom vs yellow stainer: how to tell them apart

Quick answer

The yellow stainer turns bright chrome yellow within seconds wherever it is scratched or cut, especially in the flesh of the stem base, and smells of ink or phenol; the meadow mushroom does not turn yellow, its flesh may turn slightly pinkish, and it smells pleasant. Old yellow stainers can lose the staining and smell, so a faded specimen can be hard to place.

Toxic lookalike

The yellow stainer is toxic.

Unlike the meadow mushroom, the yellow stainer (Agaricus xanthodermus) is toxic. MykoWeb's California Fungi records that it causes gastrointestinal upsets for most people, though some people report no symptoms, and that its phenol odor grows stronger when heated. The Bay Area Mycological Society describes a rapid onset of gastrointestinal symptoms and lists the toxins as unknown.

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

Two white meadow mushrooms in grass, one turned over to show pink gills and a short stem
Edible
Meadow MushroomAgaricus campestris

The tellWhite cap on a short stem, with bright pink gills that turn chocolate brown, growing in grass.

Two round, white young yellow stainers, one with a finely cracked cap, among dark leaf litter
Toxic lookalike
Yellow StainerAgaricus xanthodermus

The tellWhite Agaricus whose cap edge and stem base turn bright chrome yellow within seconds of being scratched or cut, with an ink or phenol smell.

How they differ

Differences between the meadow mushroom and the yellow stainer
FeatureMeadow MushroomYellow Stainer
Scratched cap edgeMeadow MushroomNo yellowing.Yellow StainerBright chrome yellow within seconds, then brownish.
Cut stem baseMeadow MushroomWhite, sometimes slightly pinkish.Yellow StainerChrome yellow immediately.
SmellMeadow MushroomPleasant.Yellow StainerInk, phenol or creosote.
Young gillsMeadow MushroomBright pink.Yellow StainerWhitish to pink.
RingMeadow MushroomThin and fragile, often gone.Yellow StainerThick and skirt-like.
SizeMeadow MushroomCap 1 to 4 inches (2.5 to 10 cm), short stem.Yellow StainerCap 2 to 6 inches (5 to 15 cm), stem 2 to 6 inches.

FAQ

Common questions

Does the meadow mushroom stain yellow?

No. Its flesh can turn slightly pinkish when cut but not bright yellow. A white Agaricus that turns chrome yellow at the stem base is a yellow stainer or one of its relatives.

Where does the yellow stainer grow?

In lawns, gardens, parks, hedgerows and woodland edges, often in groups or rings. North American records come mainly from California and the Pacific coast, with similar yellow-staining species elsewhere.

Sources

Where these facts come from

  1. Agaricus campestris

    MushroomExpert.com

  2. Agaricus xanthodermus

    MushroomExpert.com

  3. Toxic Mushrooms

    Bay Area Mycological Society

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