24/Aug/24, 6:18 PM
Kloostrimetsa, Tallinn, Harjumaa, Estonia
Pine wood, cemetery hedgerow in tall overgrowth
59°28'10.2"N 24°52'17.9"E
🔆 Overcast, open spot
Original Instagram postAgaricus xanthodermus
yellow stainer
- Scientific identification
- Agaricus xanthodermus Genev.
- Family
- Agaricaceae
- Class
- Agaricomycetes
- Genus
- Agaricus
Names across languages
- English: yellow stainer
- German: Karbol-Champignon
- Finnish: Myrkkyherkkusieni
- Estonian: Mürkšampinjon
- Russian: Шампиньон желтокожий
The scientific profile
From the latest record: 2024-08-24.
Hymenium
Crowded; whitish when very young, becoming pinkish and finally dark chocolate-brown as spores mature
Cap
Convex to broadly convex or nearly flat; whitish to cream or pale grey-brown, smooth to finely fibrillose, often somewhat squared or flattened at the centre; bruises rapidly bright chrome-yellow, especially along the margin
Hymenium Attachment
Free — gills do not reach the stipe
Stipe
Cylindrical, whitish, slightly enlarged or bulbous at base; rapidly stains bright yellow when rubbed or cut, particularly at the base; with a large, persistent, flaring double ring with a thickened outer margin
Spore print
Spore print very dark brown to chocolate-brown
Ecology
Saprobic on nutrient-rich and disturbed soils (lawns, gardens, parks, roadside verges, hedgerows); solitary to clustered or forming arcs; summer to autumn
Edibility
Poisonous,causes gastrointestinal poisoning
Fruit body
Fruit body medium to large; stipe ~4–15 cm long and ~1–3 cm thick
Dimensions
Cap ∅ ~5–15 cm
Flesh
Flesh white, sometimes weakly yellowing elsewhere but turning conspicuously bright chrome-yellow in the stipe base when cut or bruised, yellow colour may later fade or become brownish
Chemical reactions
KOH yellow on cap surface
Odour
Strongly phenolic, ink-like, iodine-like or carbolic, intensified by cooking
Taste
Not distinctive
Microscopy
Spores ellipsoid, smooth, thick-walled, brownish in KOH, ~4.5–5 × 3–4 µm; basidia 4-sterigmate; cheilocystidia clavate to subcylindrical, ~20–30 × 4–8 µm; pleurocystidia absent; pileipellis a cutis
Overview
Toxic white Agaricus distinguished by its extremely rapid chrome-yellow bruising and strong phenolic odour
1876). Bull. Soc. Bot. Fr. 23: 31.
Field encounters
Source hashtags
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