Panther Cap
Toxic| Scientific name | Amanita pantherina |
| Family | Amanitaceae |
| Portuguese name | Amanita-pantera, Pantera |
| English name | Panther cap |
| Season | August, September, October, November |
| Habitat | Pine forest, Cork oak, Mixed forest |
| Look-alikes | Fly Agaric |
Description
Amanita pantherina (panther cap) is a seriously poisonous mushroom that is often underestimated. Less visually striking than the fly agaric, it is more dangerous in practice — it is more frequently confused with edible species. Its neurotoxin content exceeds that of the fly agaric, leading to more severe poisonings.
Cap
- Diameter: 5–12 cm
- Shape: hemispherical when young, later convex to flattened
- Colour: dark brown, olive-brown, greyish-brown
- Surface: covered with small, pure white warts (unlike the greyish scales of the blusher)
- Margin: striate (grooved) — important identifying feature
Stem
- Height: 6–12 cm
- Width: 1–2 cm
- Colour: white
- Ring: white, smooth (without striations), positioned low on the stem
- Base: with a bulbous swelling and a characteristic “gutter” (marginate bulb) — a ring-like groove at the very base
- Volva: attached, as 1–2 rows of scales around the swollen base
Flesh
- Colour: white, does not change colour when damaged — key difference from the blusher
- Smell: faint, unremarkable
- Taste: do not taste!
Spore print
White.
Toxicity
Toxins
- Ibotenic acid — NMDA receptor agonist
- Muscimol — GABA-A receptor agonist
Toxin concentrations are up to 5 times higher than in Amanita muscaria, resulting in more severe poisonings.
Poisoning symptoms
| Parameter | Description |
|---|---|
| Onset | 30 minutes – 3 hours after ingestion |
| Peak | 1–3 hours |
| Duration | 4–12 hours |
Manifestations:
- Confusion, dizziness
- Visual and auditory hallucinations
- Muscle twitching, tremor
- Nausea, vomiting
- Seizures, in severe cases — deep coma
- Muscular hypotonia, hyporeflexia
- Possible respiratory depression
Fatality: rare but documented. A case of refractory status epilepticus with fatal outcome has been described. Particularly dangerous for children and the elderly.
Where and when
Season
- Main season: August–November
- Fruits after rains, often somewhat earlier than the fly agaric
Habitats in Portugal
- Throughout the country, from north to south
- Pine forests — most characteristic habitat
- Cork oak forests — documented in southwestern Portugal (Aljezur area)
- Mixed forests
- Forms ectomycorrhiza with both conifers and broadleaf trees
- Documented in natural parks: Alentejo SW and Costa Vicentina, Sado Estuary, Peneda-Gerês, Serra de São Mamede, Montesinho, Vale do Guadiana
Look-alikes
| Species | How to distinguish |
|---|---|
| Blusher (Amanita rubescens) | Reddens/pinkens when flesh is damaged (panther cap does NOT redden). Ring is striate (panther cap’s ring is smooth). Warts are greyish (panther cap’s are pure white) |
| Fly agaric (Amanita muscaria) | Cap red (not brown). Less toxic |
| Grey-spotted amanita (Amanita excelsa) | Warts grey, not white. No pronounced “gutter” at the base of the stem |
Key rule
If the mushroom flesh does not redden when damaged — it is NOT a blusher. Do not collect it.
Image sources
- amanita-pantherina.webp — Panther cap (Amanita pantherina). Author: George Chernilevsky. License: Public domain. Source
See Also
Habitats:
Related articles:
Sources
- Satora L. et al. — Panther cap Amanita pantherina poisoning case report and review // Toxicon, 2005
- Museu Virtual da Biodiversidade — Universidade de Évora
- Fungipedia Portugal — Amanita pantherina
- GBIF / BioDiversity4All — species records for Portugal
- First-Nature — Amanita pantherina identification
Disclaimer: Identifying mushrooms from descriptions and photographs on the internet is not a substitute for consulting an experienced mycologist. The authors assume no responsibility for the consequences of collecting and consuming mushrooms.
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