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Waldschatzfinder

Yellow stainer

Agaricus xanthodermus · Agarics (Agaricus)

Poisonous
Yellow stainer
📷 Velella, CC BY-SA 3.0 (Wikimedia Commons)
Poisonous. One of the most common causes of poisoning with field-mushroom lookalikes.

Recognise it safely – what matters

  1. Cut the stem base: instantly bright chrome yellow
  2. Smells of ink/phenol instead of aniseed or mushroom
  3. Likes parks and gardens

Features

Cap
5–15 cm, white to greyish white, often somewhat angular in outline.
Underside
Gills: pink when young, then chocolate brown.
Stem
White with a membranous ring; the base turns bright chrome yellow immediately when cut.
Flesh
White, instantly bright yellow in the stem base.
Smell
Of ink or phenol, especially when heated.
Spore print
Chocolate brown

Season

Habitat

Parks, gardens, meadows, path and forest edges, often in groups; likes nutrient-rich soils.

andre træarter

Risk of confusion

Markchampignon Edible species The field mushroom smells pleasantly mushroomy and does not turn yellow in the stem base. Anis-champignon Edible species The horse mushroom also yellows, but slowly and not brightly in the stem base – and it smells clearly of aniseed.

If someone has eaten it

Violent vomiting, diarrhoea and stomach cramps; in children and older people the loss of fluids can become dangerous. First symptoms: usually 30 minutes to 2 hours after eating.

Act immediately – even without symptoms:

  • Emergency number 112 if someone feels unwell.
  • Poison centre: Germany – area code of the nearest city with a poison centre + 19240 (e.g. Berlin 030 19240, Munich 089 19240) · Austria +43 1 406 43 43 · Switzerland 145.
  • Keep leftovers, trimmings or vomit – it helps with identification.

Never identify mushrooms by pictures or an app alone. When in doubt, ask a mushroom expert – and only pick what you know for sure.

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