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Amanita gemmata

Gemmed mushroom

A young gemmed mushroom; due to dry and warm conditions, the hat is rather pale.
Scientific classification
Kingdom: Fungi
Division: Basidiomycota
Class: Homobasidiomycetes
Subclass: Hymenomycetes
Order: Agaricales
Family: Amanitaceae
Genus: Amanita
Species: A. gemmata
Binomial name
Amanita gemmata
(Fr.) Claude Casimir Gillet
Amanita gemmata
mycological characteristics:
gills on hymenium

cap is flat


hymenium is free


stipe has a ring


spore print is white


ecology is mycorrhizal


edibility: poisonous

The gemmed mushroom (Amanita gemmata) is a mushroom of the genus Amanita, a genus of fungi including some of the most deadly mushrooms, as well as notably psychedelic mushrooms. A. gemmata resembles the false death cap, tawny grisette and panther cap mushrooms. Its pileus (cap) is a more bright color than in the former and more yellow than that of the latter two.

The cap is 3–7 cm (1-3 inches) in diameter, domed in young and flat in old specimens. It is pale yellow in dry weather, becoming a bright corn color, lighter towards the furrowed margin, and somewhat slimy in high humidity. There are few and rather large flakes of the white velum present. The gills are white , as is the stipe (stem). The lower end of the latter is usually thickened, but does not feature a prominent sheath as found in the death cap.

The gemmed mushroom occurs in forest. It favors sandy and slightly acidic soild and often forms mycorrhiza with rootlets of the Norway Spruce (Picea abies). In Central Europe, it is found between June and October and in California it is found in December.

Two recent molecular studies show that Amanita gemmata is part of a subgroup within Amanita with its close relatives the fly agaric (Amanita muscaria), A. farinosa and A. roseitincta[1][2].

Amanita gemmata is a hallucinogenic mushroom which contains ibotenic acid and muscimol. [3]


  1. ^ Moncalvo, J.-M., D. Drehmel & R. Vilgalys (2000). Variation in modes and rates of evolution in nuclear and mitochondrial ribosomal DNA in the mushroom genus Amanita (Agaricales, Basidiomycota): phylogenetic implications. Molecular Phylogenetics and Evolution 16: 48–63.
  2. ^ (1999) Molecular phylogeny of Amanita based on large subunit ribosomal DNA sequences: implications for taxonomy and character evolution. Mycologia 91: 610–618.
  3. ^ (Beutler & Der Marderosian 1981; Chilton & Ott 1976)
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Amanita_gemmata". A list of authors is available in Wikipedia.
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