False death cap

Cap

Cap 4-10 cm across, convex then broadly flat, pale lemon-yellow to straw-yellow in the typical variety (var. citrina) or entirely white in var. alba. The surface feels dry and bears irregular brownish-grey or buff patches - remnants of the universal veil - that can wash off in rain, leaving a bare pale cap.

Gills

White to pale cream, free from the stem, and crowded. Spore print white.

Stem

Stem 5-10 cm × 1-2 cm, whitish to pale yellow, with a thin but clearly membranous pendant ring. The base is enclosed in a thick, deeply cupped membranous volva, more U-shaped than sac-like.

Smell & taste

The most reliable non-visual cue is the persistent, strong smell of raw potato, turnip or radish - unusual and immediately distinctive once learned.

The principal danger is misidentification: picking Amanita phalloides or Amanita virosa when intending to collect Amanita citrina.

Even experienced foragers have made this error - and half a death cap can kill an adult - so the false death cap is best left in the forest.

If any doubt exists about identification, discard the specimen and seek expert verification before handling further.

Trace bufotenine (5-hydroxy-N,N-dimethyltryptamine) has been reported in Amanita citrina. Bufotenine is a serotonin analogue and can cause mild psychoactive effects and, in higher doses, autonomic symptoms.

It does not belong to the amatoxin family. The toxicological significance in humans from casual consumption of this species is not well-established, but caution is warranted.

Gastrointestinal upset (nausea, vomiting, diarrhoea) has been reported after eating Amanita citrina.

If Amanita phalloides has been accidentally consumed under the impression it was Amanita citrina, expect:

1. 1delayed onset (6-24 hours) of severe gastrointestinal symptoms
2. 2a deceptive remission
3. 3liver and kidney failure

Do not eat.

Although Amanita citrina is not confirmed to cause the lethal amatoxin poisoning associated with the death cap and destroying angel, the species contains trace amounts of bufotenine (a serotonin analogue with psychoactive and potentially toxic properties), and some sources report gastrointestinal upset from consumption.

The paramount safety concern, however, is not the species itself but the very real risk of misidentifying a lethal Amanita species as the false death cap.

The raw-potato smell is the single most useful differentiating feature from the death cap, but it can be faint or absent in old or rain-washed specimens. Always verify the smell by breaking the flesh close to the stem base.

Strictly mycorrhizal with broadleaf trees, mainly beech and oak, with birch and hornbeam secondary hosts; occasionally recorded under pines on sandy soils.

Prefers mildly calcareous to moderately acidic soils in deciduous or mixed woodland.

Because it shares hosts and habitat with Amanita phalloides, the two can be found fruiting within metres of each other - this proximity makes misidentification especially dangerous.

July to November in temperate western Europe, peaking August through October as the soil cools after summer rains.

Like many woodland Amanitas it waits underground as mycelium all year, then pushes fruit bodies up during the warm-wet spells of late summer and autumn - often appearing alongside Amanita phalloides under the same trees.

Solitary or in loose troops beneath the host tree canopy.

As a mycorrhizal species it has lived for years - sometimes decades - as an underground web of threads trading water and minerals with the tree roots above it. What you see pushing through the leaf litter is just the fruiting body, the temporary spore-bearing tip of something much larger and older.

The button stage breaks surface as a pale, ovoid 'egg' tightly wrapped in the universal veil. As it expands the veil tears, leaving the distinctive cup-shaped volva at the base and the brownish-grey patches stranded across the cap.

Mycorrhizal fruiter that responds to late-summer and autumn rain events once soils begin to cool; flushes coincide broadly with Boletus and Amanita phalloides flushes under the same canopy.

The chief danger is confusion with Amanita phalloides (the death cap), which shares the same habitat and woodland type.

The death cap differs by:

• more distinctly greenish-yellow, olive or grey-green cap colouration
• absence of the raw-potato smell (it has a sickly sweetish odour)
• a more open, bag-like volva

However, pale yellow or yellowish-white forms of the death cap can closely resemble Amanita citrina, making the smell test and the volva shape critical.

The all-white variety (var. alba) is even more dangerous because it overlaps closely in appearance with the pure-white forms of Amanita phalloides and with Amanita virosa (the destroying angel); none of these have the potato smell.

Amanita citrina has also been confused with Amanita gemmata (the jewelled death cap), which is more yellow-ochre, typically lacks the potato smell, and has a less developed volva.