Field Mushroom vs Death Cap
Agaricus campestris compared with Amanita phalloides — how to tell them apart in the field.
This is a dangerous confusion.
At least one of these species is potentially deadly. Never eat a wild mushroom based on a photo comparison alone — verify with local experts.
How to Tell Them Apart
The critical confusion. Young Death Caps look almost identical to young Field Mushrooms — both are white and button-shaped. Key differences: Death Cap gills are WHITE and stay white. Field Mushroom gills are PINK turning brown. Death Cap has a sac-like volva (cup) at the stem base — dig it up to check. Death Cap often grows near oaks and other trees, not in open pastures. Getting this wrong is fatal.
A common edible mushroom. Key differences: Field Mushrooms have pink-to-brown gills (never white), a chocolate-brown spore print, and no volva at the base. If the gills are white and there's a sac at the base, you may be holding a Death Cap.
Side-by-Side Identification
| Trait | Field Mushroom | Death Cap |
|---|---|---|
| Cap | 3–10 cm across. Starts as a smooth white dome, opens to a broad convex shape, sometimes flattening with age. Surface is dry, white to cream, occasionally developing fine brownish scales in the center. Feels silky when young. | 5-15 cm across. Starts egg-shaped, opens to convex then flat. Color ranges from pale greenish-yellow to olive green, sometimes almost white. Surface is smooth and slightly sticky when wet. No warts or patches (unlike Fly Agaric). The green tinge is the key tell, but pale specimens can fool you. |
| Gills | The key ID feature. Start bright pink in young specimens, darken to chocolate brown, then near-black as spores mature. Closely spaced, free (not attached to the stem). NEVER white — if they're white, you're looking at something else, possibly deadly. | White, closely spaced, and free (not attached to the stem). They stay white even as the mushroom ages — no color change. |
| Stem | 3–10 cm tall, white, sturdy but not bulky. Has a thin, fragile ring partway up that often disappears with age. No volva (cup) at the base — this is critical. Death Caps have a volva; Field Mushrooms don't. | 8-15 cm tall, white to pale green, with a prominent drooping skirt-like ring near the top. The base sits inside a cup-shaped volva (sac) that's often buried underground. Always dig up the base to check for the volva — it's the single most important identification feature. |
| Spore print | Dark chocolate brown — almost black. Drop it on white paper overnight. | White. |
| Odor | Pleasant, mushroomy. That classic 'fresh mushroom' smell you know from the grocery store. | Faintly sweet and pleasant when young. Becomes sickly sweet and unpleasant as it ages — sometimes described as honey-like turning to rotting. |
| Habitat | Grasslands, pastures, meadows, lawns, and parks — anywhere with rich soil and short grass. Loves fields grazed by horses and cattle. A saprobe that feeds on decaying organic matter in the soil, not on tree roots. Avoids dense forests. | Forms mycorrhizal relationships with hardwood trees, especially oaks. Also found near beeches, chestnuts, and occasionally conifers. Prefers well-drained soils in woodlands, parks, and suburban yards with established trees. |
| Season | Late summer through autumn. Peak fruiting after warm rain in August–October in the Northern Hemisphere. Can appear as early as June in mild years. | Late summer through late autumn. Peak fruiting is September through November in the Northern Hemisphere; March through May in Australia. |
Found one of these in the wild? Don't rely on memory — identify it from a photo with Orangutany and check it against both species before you touch it.